pressure in vacuum tank

例句：

1. 1.The vacuum cleaner is designed to suck up dust and dirt.
   真空吸尘器设计用来吸走灰尘和污垢。
2. 2.The room was left in a vacuum after the fire.
   火灾过后，房间一片狼藉。
3. 3. The vacuum cleaner has been used for decades, and it's still reliable.
   这个真空吸尘器已经使用了几十年，仍然很可靠。