Semigroup
[計] 半群
??? 情景例句
I have been talking to a group of salesmen
我一直在與一群推銷人員談話
Don't try to brainwash me.
別想給我洗腦。
Not at all, smiled Lucy. You're welcome!
“沒關系，”露茜笑著說，“不用謝！”