Forepump
前置真空泵, 预抽真空泵
🗣️ 情景例句
It is generally believed that Chinese are poor public speakers.
一般认为中国人不擅长公众演讲。
I will take a ship.
我将去搭船。
Today, although the old Galileo lives on in many popular writings,
今天，虽然已故的伽利略继续活在许多通俗读物中，