Forvacuum
预(抽)真空
🗣️ 情景例句
What material is this made from?
这是什么材料做的？
I didn't read the whole paper, front page.
我没有看到报纸的全部，我只是大概看了头版。
Work on it had begun before my sister left.
这栋房子在我姐姐离开之前就已动工了，