Nilmanifold
[数]幂零流形
🗣️ 情景例句
Those are the rules and regulations, and we have to abide by them.
这些就是这儿的规矩， 大家都应该遵守。
What do you do in your spare time?
闲暇时，你干些什么？
Which girl? I must thank her!
哪个女孩？我得感谢她！