Hemigroup
[计] 半群
🗣️ 情景例句
It was wet yesterday.
昨天下雨。
Very please to meet you.
见到您很高兴。
I bound the base of the tree with sticky tape, making it impossible for the ants to reach the aphids.
我用一条胶带把桃树底部包上，不让蚂蚁接近蚜虫。