Nitrourea
硝基脲
🗣️ 情景例句
It's no use crying over spilt milk. What's done cannot be undone.
覆水难收。
Would you wait here for a minute?
您能在这里等一下吗？
That sounds interesting. That was a hundred years ago, wasn't it?
听起来很有意思。那是一百年前的事了，不是吗？