Monoid
[计] 独异点; 类群
🗣️ 情景例句
I have to turn off the lights,
我得关掉灯，
I asked him to play with me, but he wouldn't.
我请他和我玩，但是他不肯。
I hope you are well. Thank you for your last letter.
愿你身体健康。感谢你上次来信。