Staged vehicle
多级火箭
🧩 词语组成解析
a. 分期的
🗣️ 情景例句
What room are you in, sir?
先生，您住几号房？
We're jumping about in excitement at the discovery.
我们因为这一发现而兴奋得手舞足蹈。
It's a secret between you and me.
这是你我之间的秘密。