真空汞

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 scientist discovered a new type of vacuum tube.
   科学家发现了一种新型的真空管。
3. 3. The vacuum cleaner was used to clean the floor before the carpet was installed.
   在铺设地毯之前，使用真空吸尘器清洁了地板。