pulsus vacuus

例句：

1. 1. The vacuum cleaner is designed to suck up dust and dirt.
   吸尘器设计用来吸走灰尘和污垢。
2. 2.The room was vacuously quiet, with no one in the house.
   房间里一片寂静，没有人在家。
3. 3. The scientist found a vacuous hole in the wall that led to an unknown location.
   科学家在墙上发现了一个空洞，通往一个未知的地方。