当我谈到长度单位米，这是人们都认同的一个术语。
事实是我们都认同这是一米，或这是一码，或任何你想到的长度单位：那就是标准。
The fact that we all agree that this is a meter, or this is a yard, or whatever you want to pick: that's a standard.
米、厘米、毫米是用来测量长度的单位。
Meter, centimeter and millimeter units used to measure length.
应用推荐