Perhalogeno-
[化] 全鹵(代)(代替所有C上的氫)
??? 情景例句
we're not sure
我們還不能肯定
Some persons do first, think afterwards, and then repent for ever.
有些人做了再思考，從而悔恨終身。
Hubei? I can't find it. Where is it?
湖北？我找不到，在哪兒？