關於 page marker ，我們在網路上蒐集到這些相關的討論、資訊與評價

我呢世人盡量什麼都盡做，所以可以遺憾的事5隻手指數得晒……
其中一件就是這個了……

執野發現到呢盒蠟筆，令我想起一件遺憾的事。
我之前講過，我小學時應該仲處於混沌中，所以成績超差，就只有美術叻。

但因為成績差，所以成日被老師針對……變相就算無做咩都被認為操行差(唔出聲又比老師喝同罰企呀陰公)，anyway總之就是不被看好的一群。

當好多老師放棄我，我自己都放棄自己時，就是我班主任，江老師沒放棄我。
每次見家長，不會挑我差的去數我，就只會讚我有天份的地方跟我媽說。
雖然那時候我並不認為我自己美術好，也許是所有野都差時老師搵d野去讚下吧 。

但是她是緊張我的……也是唯一沒放棄我的老師……
經常讚我美術有天份叫我不要放棄，
也順手叫我其他科努力一點才可以考間好中學繼續發展。

她，對於一個無助又不被看好的小朋友來說簡直是救命燈，也是因為她我有好好的努力，也是因為她……
我小時候才不覺得自己一無所有，
maybe我真的有才能?至少……她比很多機會我，
做海報，postcard也指定要我做，我記得她送了一盒marker給我，叫我可以畫多d畫。

然後，我終於沒有讓她失望……
我終於開竅了……
考到家ok的中學，然後……一直到現在還在創作。
在我想放棄創作的時候，我會記得她，也同時有你們，
還有神總會安排些天使要我繼續下去，於是就一直這樣了。

堅持難……真的很x難……我比誰都明白。
所以運動員們的辛苦，和藝術家的辛苦……希望大家過了奧運後還能一直記得，不是咀上支持，
大家的ig...page....etc....也給予多點like,share,support吧。我們不是Kol,
是用自己的青春，時間心血去生活，有機會代表香港不是運氣，
是一直堅持下來的努力。

講回正題……

小孩子無助時真係好慘既其實，
既不懂表達，卻又實在地感到強烈的被離棄的孤獨。
因為江老師的伸出援手，
我今天才能跟大家分享我的故事，
在很多平台鼓勵過下一代……

所以我說很想找到江老師，說聲謝謝，
對她說我從沒忘記她。

早幾年有在網絡上找，我也email到以前的小學，
我還以前可以報恩了。
誰知道殺出了另一位江老師……
她錯認了我……唉

事情實在太尷尬……
結果真正的江老師找不到，也害另一位老師白歡迎一場。

後來我找到真正江老師的相，本來想發上網找，
因為我知道她全家移民到了美國，要找真的可能要網絡找。
但是想多一層……其實公開別人的照片很不禮貌，
有機會讓別人一家造成困擾……

所以我放棄了。

這蠟筆本來是想雕一系列的東西再鑲入畫架送給江老師的……(因為唇膏我怕老師處理不了)

應該沒這個機會了……

找到它，
心很酸啦……
所以我要好好用它，把我對江老師的感謝化成作品，
今生也許不能再次相遇……

但願心意透過我的腦波，靈魂傳到去她那裡。

呀，
還有的是……

不要太早否定(應該是不要否定)小孩子，
每個人都是有價值的!
任何人的一句半句否定足以讓一個小孩子爭扎一生。

可以的話，多說造就人的話，
留意多一點孤獨的孩子，成為他們生命的小火花。

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📜 [專欄新文章] Uniswap v3 Features Explained in Depth

✍️ 田少谷 Shao

📥 歡迎投稿： https://medium.com/taipei-ethereum-meetup #徵技術分享文 #使用心得 #教學文 #medium

Once again the game-changing DEX 🦄 👑

Image source: https://uniswap.org/blog/uniswap-v3/

Outline

0. Intro1. Uniswap & AMM recap2. Ticks 3. Concentrated liquidity4. Range orders: reversible limit orders5. Impacts of v36. Conclusion

0. Intro

The announcement of Uniswap v3 is no doubt one of the most exciting news in the DeFi place recently 🔥🔥🔥

While most have talked about the impact v3 can potentially bring on the market, seldom explain the delicate implementation techniques to realize all those amazing features, such as concentrated liquidity, limit-order-like range orders, etc.

Since I’ve covered Uniswap v1 & v2 (if you happen to know Mandarin, here are v1 & v2), there’s no reason for me to not cover v3 as well ✅

Thus, this article aims to guide readers through Uniswap v3, based on their official whitepaper and examples made on the announcement page. However, one needs not to be an engineer, as not many codes are involved, nor a math major, as the math involved is definitely taught in your high school, to fully understand the following content 😊😊😊

If you really make it through but still don’t get shxt, feedbacks are welcomed! 🙏

There should be another article focusing on the codebase, so stay tuned and let’s get started with some background noise!

1. Uniswap & AMM recap

Before diving in, we have to first recap the uniqueness of Uniswap and compare it to traditional order book exchanges.

Uniswap v1 & v2 are a kind of AMMs (automated market marker) that follow the constant product equation x * y = k, with x & y stand for the amount of two tokens X and Y in a pool and k as a constant.

Comparing to order book exchanges, AMMs, such as the previous versions of Uniswap, offer quite a distinct user experience:

AMMs have pricing functions that offer the price for the two tokens, which make their users always price takers, while users of order book exchanges can be both makers or takers.

Uniswap as well as most AMMs have infinite liquidity¹, while order book exchanges don’t. The liquidity of Uniswap v1 & v2 is provided throughout the price range [0,∞]².

Uniswap as well as most AMMs have price slippage³ and it’s due to the pricing function, while there isn’t always price slippage on order book exchanges as long as an order is fulfilled within one tick.

In an order book, each price (whether in green or red) is a tick. Image source: https://ftx.com/trade/BTC-PERP

¹ though the price gets worse over time; AMM of constant sum such as mStable does not have infinite liquidity

² the range is in fact [-∞,∞], while a price in most cases won’t be negative

³ AMM of constant sum does not have price slippage

2. Tick

The whole innovation of Uniswap v3 starts from ticks.

For those unfamiliar with what is a tick:

Source: https://www.investopedia.com/terms/t/tick.asp

By slicing the price range [0,∞] into numerous granular ticks, trading on v3 is highly similar to trading on order book exchanges, with only three differences:

The price range of each tick is predefined by the system instead of being proposed by users.

Trades that happen within a tick still follows the pricing function of the AMM, while the equation has to be updated once the price crosses the tick.

Orders can be executed with any price within the price range, instead of being fulfilled at the same one price on order book exchanges.

With the tick design, Uniswap v3 possesses most of the merits of both AMM and an order book exchange! 💯💯💯

So, how is the price range of a tick decided?

This question is actually somewhat related to the tick explanation above: the minimum tick size for stocks trading above 1$ is one cent.

The underlying meaning of a tick size traditionally being one cent is that one cent (1% of 1$) is the basis point of price changes between ticks, ex: 1.02 — 1.01 = 0.1.

Uniswap v3 employs a similar idea: compared to the previous/next price, the price change should always be 0.01% = 1 basis point.

However, notice the difference is that in the traditional basis point, the price change is defined with subtraction, while here in Uniswap it’s division.

This is how price ranges of ticks are decided⁴:

Image source: https://uniswap.org/whitepaper-v3.pdf

With the above equation, the tick/price range can be recorded in the index form [i, i+1], instead of some crazy numbers such as 1.0001¹⁰⁰ = 1.0100496621.

As each price is the multiplication of 1.0001 of the previous price, the price change is always 1.0001 — 1 = 0.0001 = 0.01%.

For example, when i=1, p(1) = 1.0001; when i=2, p(2) = 1.00020001.

p(2) / p(1) = 1.00020001 / 1.0001 = 1.0001

See the connection between the traditional basis point 1 cent (=1% of 1$) and Uniswap v3’s basis point 0.01%?

Image source: https://tenor.com/view/coin-master-cool-gif-19748052

But sir, are prices really granular enough? There are many shitcoins with prices less than 0.000001$. Will such prices be covered as well?

Price range: max & min

To know if an extremely small price is covered or not, we have to figure out the max & min price range of v3 by looking into the spec: there is a int24 tick state variable in UniswapV3Pool.sol.

Image source: https://uniswap.org/whitepaper-v3.pdf

The reason for a signed integer int instead of an uint is that negative power represents prices less than 1 but greater than 0.

24 bits can cover the range between 1.0001 ^ (2²³ — 1) and 1.0001 ^ -(2)²³. Even Google cannot calculate such numbers, so allow me to offer smaller values to have a rough idea of the whole price range:

1.0001 ^ (2¹⁸) = 242,214,459,604.341

1.0001 ^ -(2¹⁷) = 0.000002031888943

I think it’s safe to say that with a int24 the range can cover > 99.99% of the prices of all assets in the universe 👌

⁴ For implementation concern, however, a square root is added to both sides of the equation.

How about finding out which tick does a price belong to?

Tick index from price

The answer to this question is rather easy, as we know that p(i) = 1.0001^i, simply takes a log with base 1.0001 on both sides of the equation⁴:

Image source: https://www.codecogs.com/latex/eqneditor.php

Let’s try this out, say we wanna find out the tick index of 1000000.

Image source: https://ncalculators.com/number-conversion/log-logarithm-calculator.htm

Now, 1.0001¹³⁸¹⁶² = 999,998.678087146. Voila!

⁵ This formula is also slightly modified to fit the real implementation usage.

3. Concentrated liquidity

Now that we know how ticks and price ranges are decided, let’s talk about how orders are executed in a tick, what is concentrated liquidity and how it enables v3 to compete with stablecoin-specialized DEXs (decentralized exchange), such as Curve, by improving the capital efficiency.

Concentrated liquidity means LPs (liquidity providers) can provide liquidity to any price range/tick at their wish, which causes the liquidity to be imbalanced in ticks.

As each tick has a different liquidity depth, the corresponding pricing function x * y = k also won’t be the same!

Each tick has its own liquidity depth. Image source: https://uniswap.org/blog/uniswap-v3/

Mmm… examples are always helpful for abstract descriptions 😂

Say the original pricing function is 100(x) * 1000(y) = 100000(k), with the price of X token 1000 / 100 = 10 and we’re now in the price range [9.08, 11.08].

If the liquidity of the price range [11.08, 13.08] is the same as [9.08, 11.08], we don’t have to modify the pricing function if the price goes from 10 to 11.08, which is the boundary between two ticks.

The price of X is 1052.63 / 95 = 11.08 when the equation is 1052.63 * 95 = 100000.

However, if the liquidity of the price range [11.08, 13.08] is two times that of the current range [9.08, 11.08], balances of x and y should be doubled, which makes the equation become 2105.26 * 220 = 400000, which is (1052.63 * 2) * (110 * 2) = (100000 * 2 * 2).

We can observe the following two points from the above example:

Trades always follow the pricing function x * y = k, while once the price crosses the current price range/tick, the liquidity/equation has to be updated.

√(x * y) = √k = L is how we represent the liquidity, as I say the liquidity of x * y = 400000 is two times the liquidity of x * y = 100000, as √(400000 / 100000) = 2.

What’s more, compared to liquidity on v1 & v2 is always spread across [0,∞], liquidity on v3 can be concentrated within certain price ranges and thus results in higher capital efficiency from traders’ swapping fees!

Let’s say if I provide liquidity in the range [1200, 2800], the capital efficiency will then be 4.24x higher than v2 with the range [0,∞] 😮😮😮 There’s a capital efficiency comparison calculator, make sure to try it out!

Image source: https://uniswap.org/blog/uniswap-v3/

It’s worth noticing that the concept of concentrated liquidity was proposed and already implemented by Kyper, prior to Uniswap, which is called Automated Price Reserve in their case.⁵

⁶ Thanks to Yenwen Feng for the information.

4. Range orders: reversible limit orders

As explained in the above section, LPs of v3 can provide liquidity to any price range/tick at their wish. Depending on the current price and the targeted price range, there are three scenarios:

current price < the targeted price range

current price > the targeted price range

current price belongs to the targeted price range

The first two scenarios are called range orders. They have unique characteristics and are essentially fee-earning reversible limit orders, which will be explained later.

The last case is the exact same liquidity providing mechanism as the previous versions: LPs provide liquidity in both tokens of the same value (= amount * price).

There’s also an identical product to the case: grid trading, a very powerful investment tool for a time of consolidation. Dunno what’s grid trading? Check out Binance’s explanation on this, as this topic won’t be covered!

In fact, LPs of Uniswap v1 & v2 are grid trading with a range of [0,∞] and the entry price as the baseline.

Range orders

To understand range orders, we’d have to first revisit how price is discovered on Uniswap with the equation x * y = k, for x & y stand for the amount of two tokens X and Y and k as a constant.

The price of X compared to Y is y / x, which means how many Y one can get for 1 unit of X, and vice versa the price of Y compared to X is x / y.

For the price of X to go up, y has to increase and x decrease.

With this pricing mechanism in mind, it’s example time!

Say an LP plans to place liquidity in the price range [15.625, 17.313], higher than the current price of X 10, when 100(x) * 1000(y) = 100000(k).

The price of X is 1250 / 80 = 15.625 when the equation is 80 * 1250 = 100000.

The price of X is 1315.789 / 76 = 17.313 when the equation is 76 * 1315.789 = 100000.

If now the price of X reaches 15.625, the only way for the price of X to go even higher is to further increase y and decrease x, which means exchanging a certain amount of X for Y.

Thus, to provide liquidity in the range [15.625, 17.313], an LP needs only to prepare 80 — 76 = 4 of X. If the price exceeds 17.313, all 4 X of the LP is swapped into 1315.789 — 1250 = 65.798 Y, and then the LP has nothing more to do with the pool, as his/her liquidity is drained.

What if the price stays in the range? It’s exactly what LPs would love to see, as they can earn swapping fees for all transactions in the range! Also, the balance of X will swing between [76, 80] and the balance of Y between [1250, 1315.789].

This might not be obvious, but the example above shows an interesting insight: if the liquidity of one token is provided, only when the token becomes more valuable will it be exchanged for the less valuable one.

…wut? 🤔

Remember that if 4 X is provided within [15.625, 17.313], only when the price of X goes up from 15.625 to 17.313 is 4 X gradually swapped into Y, the less valuable one!

What if the price of X drops back immediately after reaching 17.313? As X becomes less valuable, others are going to exchange Y for X.

The below image illustrates the scenario of DAI/USDC pair with a price range of [1.001, 1.002] well: the pool is always composed entirely of one token on both sides of the tick, while in the middle 1.001499⁶ is of both tokens.

Image source: https://uniswap.org/blog/uniswap-v3/

Similarly, to provide liquidity in a price range < current price, an LP has to prepare a certain amount of Y for others to exchange Y for X within the range.

To wrap up such an interesting feature, we know that:

Only one token is required for range orders.

Only when the current price is within the range of the range order can LP earn trading fees. This is the main reason why most people believe LPs of v3 have to monitor the price more actively to maximize their income, which also means that LPs of v3 have become arbitrageurs 🤯

I will be discussing more the impacts of v3 in 5. Impacts of v3.

⁷ 1.001499988 = √(1.0001 * 1.0002) is the geometric mean of 1.0001 and 1.0002. The implication is that the geometric mean of two prices is the average execution price within the range of the two prices.

Reversible limit orders

As the example in the last section demonstrates, if there is 4 X in range [15.625, 17.313], the 4 X will be completely converted into 65.798 Y when the price goes over 17.313.

We all know that a price can stay in a wide range such as [10, 11] for quite some time, while it’s unlikely so in a narrow range such as [15.625, 15.626].

Thus, if an LP provides liquidity in [15.625, 15.626], we can expect that once the price of X goes over 15.625 and immediately also 15.626, and does not drop back, all X are then forever converted into Y.

The concept of having a targeted price and the order will be executed after the price is crossed is exactly the concept of limit orders! The only difference is that if the range of a range order is not narrow enough, it’s highly possible that the conversion of tokens will be reverted once the price falls back to the range.

As price ranges follow the equation p(i) = 1.0001 ^ i, the range can be quite narrow and a range order can thus effectively serve as a limit order:

When i = 27490, 1.0001²⁷⁴⁹⁰ = 15.6248.⁸

When i = 27491, 1.0001²⁷⁴⁹¹ = 15.6264.⁸

A range of 0.0016 is not THAT narrow but can certainly satisfy most limit order use cases!

⁸ As mentioned previously in note #4, there is a square root in the equation of the price and index, thus the numbers here are for explantion only.

5. Impacts of v3

Higher capital efficiency, LPs become arbitrageurs… as v3 has made tons of radical changes, I’d like to summarize my personal takes of the impacts of v3:

Higher capital efficiency makes one of the most frequently considered indices in DeFi: TVL, total value locked, becomes less meaningful, as 1$ on Uniswap v3 might have the same effect as 100$ or even 2000$ on v2.

The ease of spot exchanging between spot exchanges used to be a huge advantage of spot markets over derivative markets. As LPs will take up the role of arbitrageurs and arbitraging is more likely to happen on v3 itself other than between DEXs, this gap is narrowed … to what extent? No idea though.

LP strategies and the aggregation of NFT of Uniswap v3 liquidity token are becoming the blue ocean for new DeFi startups: see Visor and Lixir. In fact, this might be the turning point for both DeFi and NFT: the two main reasons of blockchain going mainstream now come to the alignment of interest: solving the $$ problem 😏😏😏

In the right venue, which means a place where transaction fees are low enough, such as Optimism, we might see Algo trading firms coming in to share the market of designing LP strategies on Uniswap v3, as I believe Algo trading is way stronger than on-chain strategies or DAO voting to add liquidity that sort of thing.

After reading this article by Parsec.finance: The Dex to Rule Them All, I cannot help but wonder: maybe there is going to be centralized crypto exchanges adopting v3’s approach. The reason is that since orders of LPs in the same tick are executed pro-rata, the endless front-running speeding-competition issue in the Algo trading world, to some degree, is… solved? 🤔

Anyway, personal opinions can be biased and seriously wrong 🙈 I’m merely throwing out a sprat to catch a whale. Having a different voice? Leave your comment down below!

6. Conclusion

That was kinda tough, isn’t it? Glad you make it through here 🥂🥂🥂

There are actually many more details and also a huge section of Oracle yet to be covered. However, since this article is more about features and targeting normal DeFi users, I’ll leave those to the next one; hope there is one 😅

If you have any doubt or find any mistake, please feel free to reach out to me and I’d try to reply AFAP!

Stay tuned and in the meantime let’s wait and see how Uniswap v3 is again pioneering the innovation of DeFi 🌟

Uniswap v3 Features Explained in Depth was originally published in Taipei Ethereum Meetup on Medium, where people are continuing the conversation by highlighting and responding to this story.

👏 歡迎轉載分享鼓掌

Paint with me and my sister! Since we are at home in quarantine, we decided to re-decorate our rooms with some cute handpainted paintings.🎨We used acrylic paint for the main colours, and sharpie for the black outlines. We found two old photo frames and cork-board at home, so we used those to frame up some of our finished paintings.🌟

在家裡有點無聊所以我們就決定用手繪畫來造型裝飾我們的房間✨改造成兩種可愛玩具總動員風格和ins文青風的房間。我們用的材料有舊的照片框，壓克力顏料，硬畫紙和馬克筆。簡單又好玩🎨！

My Supplies:
♡ Sharpie | Permanent Marker - Black
https://www.sharpie.com/all-markers/specialty/extreme/SHExtremeBlackFine
♡ Liquitex | Basic Acrylic Paint Tube 48-Piece Set
https://www.amazon.ca/Liquitex-101048-Basics-Acrylic-48-Piece/dp/B00251I66C
♡ Photo Frames | from Ikea
https://www.ikea.com/ca/en/cat/picture-photo-frames-18746/?page=2

Connect with Me!
♡ Instagram | @x.yunny.x
♡ Instagram | @my.eatz
♡ Email | yunnyhou@gmail.com

Music:
Music by Eric Reprid - June Blues - https://thmatc.co/?l=8D73474

What I use:
♡ Camera | Canon G7X Mark ii
♡ Doodles | Sketchbook iPad App
♡ Editing | Final Cut Pro x Adobe Premiere Pro

【チャンネル登録】⇒https://goo.gl/ZQ3v90
【動画検索】⇒http://studiomegaane.com/
【Apple Music】⇒https://itunes.apple.com/jp/artist/studio-megaane/1472190745
【Twitter】⇒https://twitter.com/me_gaane

【再生リスト「2020's 8bit」】⇒https://www.youtube.com/playlist?list=PLz4hpi3aJ2GFiDiJXNNs6mJXXfIvNEE5H
【再生リスト「少年ジャンプアニメ -Shōnen Jump amine 8bit-」】⇒https://www.youtube.com/playlist?list=PLz4hpi3aJ2GHsKgVinv3I8tBzi5dobFdd

「Star Marker/My Hero Academia」
作詞 - 谷口鮪 / 作曲 - 谷口鮪 / 編曲 - KANA-BOON、金澤ダイスケ / 歌 - KANA-BOON

【僕のヒーローアカデミア】2020年
原作 - 堀越耕平 / 制作 - ボンズ

☆年代別楽曲検索★
【2020年代】⇒http://studiomegaane.com/2020%e5%b9%b4%e4%bb%a3/
【2010年代】⇒http://studiomegaane.com/sample-page/2010%e5%b9%b4%e4%bb%a3/
【2000年代】⇒http://studiomegaane.com/sample-page/2000%e5%b9%b4%e4%bb%a3/
【1990年代】⇒http://studiomegaane.com/sample-page/1990%e5%b9%b4%e4%bb%a3/
【1980年代】⇒http://studiomegaane.com/sample-page/1980%e5%b9%b4%e4%bb%a3/
【1970年代】⇒http://studiomegaane.com/sample-page/1970%e5%b9%b4%e4%bb%a3/
【1960年代】⇒http://studiomegaane.com/sample-page/1960%e5%b9%b4%e4%bb%a3/
【1950年代】⇒http://studiomegaane.com/sample-page/1950%e5%b9%b4%e4%bb%a3/

#僕のヒーローアカデミア #スターマーカー #8bit #StudioMegaane #chiptune

รองเท้าถือเป็นสิ่งแรกๆที่ทุกๆคนสักเกต แถมยังเป็นสิ่งที่สำคัญในการแต่งตัวของคุณ แต่สิ่งที่คุณต้องให้ความสำคัญคือ ความสะอาด โดยเฉพาะกับรองเท้าที่มีสีขาว วันนี้ผมเลยจะมาบอกเคล็ดลับที่จะทำให้รองเท้า เหลืองๆของคุณกลับมาขาวเหมือนใหม่อีกครั้ง

►ปากกา Mid Sole Marker ► http://bit.ly/2EKGSAP
►Jason Markk Essential Kit ► http://bit.ly/35aEjmN

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OUR FACEBOOK PAGE ► @OfficialFaradise
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For Business ► [email protected]

คลิปอื่นๆเกี่ยวกับทรงผม‼️
เซ็ทผม "3 สไตล์ ใน1ทรง" กับ Hanz De Fuko "Quicksand" : https://bit.ly/2IClf7f
วิธี "เลือกทรงผม" ให้เข้ากับโครงหน้าของคุณ : https://bit.ly/2I7qKM9
10 ทรงผมสุด เท่และดูดี สำหรับ“นักเรียนชาย” : https://bit.ly/2KbjZLB
7 ทรงผมของผู้ชาย ที่ผู้หญิง"ไม่ชอบ" : https://bit.ly/2Zl1nwq

คลิปอื่นๆเกี่ยวกับ แฟชั่น‼️
เสื้อยืด ยี่ห้อไหนดีและคุ้มราคา ที่สุด : https://bit.ly/2MFAjX0
10 วิธี "แต่งตัวให้ดูแพง" ราคาประหยัด : https://bit.ly/2nz6A69
5 วิธี "พับขากางเกง" ให้ดูเท่และมีสไตส์" : https://bit.ly/2lmvR2B
วิธีเลือก "แว่นกันแดด" ให้เข้ากับโครงหน้า ใส่แล้วดูดี : https://bit.ly/2R8oUxs
10 สิ่งที่"ผู้ชายดูดี" ไม่มีวันทำ : https://bit.ly/2m29RKO

คลิปอื่นๆเกี่ยวกับ ความสัมพันธ์‼️
10 สิ่งผู้ชายทำ ที่ผู้หญิงมองว่า "น่ากลัว" : https://bit.ly/2RylPas
99% ของผู้หญิง "จะเปลื่ยนใจ" ถ้าคุณทำแบบนี้ : https://bit.ly/2IyKGIp
#1 สิ่งที่จะทำให้ผู้หญิง "ไล่ตาม" คุณ : https://bit.ly/2x6XPBJ
สิ่งที่ผู้หญิง มองหาในตัวผู้ชาย : https://bit.ly/2KrkK3i
วิธีทําให้ผู้ชาย"หลงเสน่ห์" จนไม่มองคนอื่น : https://bit.ly/2KBvj4b