Presheaf
预层
🗣️ 情景例句
Let us try it!
让我们试试吧！
How thick is the ice here?
这儿的冰有多厚？
When I boarded the train, I could not help noticing that a great many local people got on as well.
上车后，我不禁注意到许多当地人也上了车。