Vacuum purge
[化] 真空驱气
🧩 词语组成解析
🗣️ 情景例句
Can it be earlier than that?
能早点吗？
While you were writing letters,I was reading a book.
当你正在写信时，我正在读一本书。
It was necessary, therefore, to invent instruments that neither slumbered nor slept.
因此，有必要发明一种仪器，既不打盹儿，也不睡觉。