Dideuteroethylene
二氘(代)乙烯
??? 情景例句
Are you sure?
你確定？
One should not run with the hare and hunt with the hounds.
不應兩面討好。
This was more than we could bear, so we decided to spend our last day exploring the countryside.
人多得使我們難以忍受，于是我們決定利用最后一天去鄉間一游。