Vacuum cavity
[医] 真空腔
🧩 词语组成解析
🗣️ 情景例句
Typing is easy once you get the hang of it.
一旦你掌握诀窍，打字就很简单。
This country is famous for its beautiful lakes.
这个国家以其美丽的湖泊而闻名于世。
We seem to be three packages short.
好像少了三大箱。