Semigroup
[计] 半群
🗣️ 情景例句
I'll need a few minutes to check over my notes again.
我再需要几分钟来核对一下我的笔记。
You look very tried tonight.
今晚你看起来很疲倦。
We're out of one item on your order.
你我订的货里有一项我们没有了，