Learn how to pronounce Efficiency in English --- EFFICIENCY Pronunciation of Efficiency: /ɪ'fɪʃənsiː/ - [ef·fi·cien·cy] (n.) ... <看更多>

Jun 26, 2017 - This Video made using: http://amzn.to/2tISuzL[Asus Pro P2420LA-WO0454D (Intel core i3 /5th Gen /4 GB /1 TB / 2 GHz / DOS ) (Black)]Voice ... ... <看更多>