Hemigroup
[计] 半群
🗣️ 情景例句
He forgave me for losing his notebook.
他原谅我遗失他的笔记本。
Do not sell the bear's skin before you have caught the bear.
熊未到手休卖皮（勿过早乐观）。
that given a planet only approximately like our own, life is almost certain to start.
如果设想有一颗行星和我们地球的情况基本相似，那几乎肯定会产生生命。