Forepump
前置真空泵, 预抽真空泵
🗣️ 情景例句
Have you?
你呢？
We have drapes for the living room,but we need kitchen curtains.
我们有客厅窗帘，但是我们需要厨房窗帘。
Snow lay thick on the ground.
地上积着厚厚的雪。