Staged vehicle
多级火箭
🧩 词语组成解析
a. 分期的
🗣️ 情景例句
I hope so.
希望没事。
I invited him to come in, but he wouldn't.
我请他进来，但是他不肯。
I think we can draw up a tentative plan now.
我认为现在可以先草拟一具临时方案。