Monoid
[计] 独异点; 类群
🗣️ 情景例句
Good-bye, Richard, and good luck. See you in two weeks.
再见， Richard， 祝你好运。两周后见。
I've made a reservation at the hotel you used last time.
我已预订了你上次住过的旅馆。
What they had in fact found was a ship which had been sunk many years before.
事实上，他们发现的是另一艘沉没多年的船。