Staged vehicle
多级火箭
🧩 词语组成解析
a. 分期的
🗣️ 情景例句
How come I wasn't told?
你怎么没有听说？
How long has it been since you've heard from your uncle?
自从你听到叔叔的消息有多长时间了？
Oh, dear! said Miss Yang. Are you sure you've lost it?
“哎呀！”杨小姐说，“你肯定你弄丢了？”