Hemigroup
[计] 半群
🗣️ 情景例句
Nice talking to you, sir.
我也很高兴与您交谈 ，先生。
He that sups with the devil must have a long spoon.
与恶人交往，须特别提防。
Sure! What's your name, please?
当然可以。你叫什么名字 ？