Submanifold
子流形, 子簇
🗣️ 情景例句
Never pump gas with the engine running.
发动机在运转时，别加油。
He gave her his word that he would never be late again.
他向她保证，绝不再迟到。
As I soon learnt, he was English himself!'
我很快了解到，他自己就是个英国人！