例如：I have a few reference books at home. / There is a little orange juice in the fridge. 然後，再分辨有'a' 和無'a' 的分別。a few/ a little 意思是「 ... ... <看更多>

英文文法＃a few few a little little a little, little, a few, few, fewer, less 的用法如何? a few Vs few, a little Vs little, fewer Vs less 有 ... ... <看更多>

上面的报错实际意思指的是缺少openslam_gmapping 包，解决方法是git clone相关源码一起编译， ... robots need a little help from maps, just like the rest of us. ... <看更多>