Nbr
abbr. 腈基丁二烯橡胶（nitrile -butadiene rubber）
🗣️ 情景例句
If I marry you, there are going to be some ground rules.
要我嫁给你，有一些基本前提。
If I had known her telephone number, I would have called her.
如果我知道她的电话号码，我就给她打电话了。
Are they your books?
这些是你的书吗？