final vacuum

• 后真空,后排气,极限真空度,极限真空

final vacuum的用法和样例：

例句

1. The porter turned off the vacuum.
   清洁工关掉真空吸尘器。
2. Some pumps and all vacuum cleaners work by suction.
   有些泵和所有真空吸尘器都是借吸力工作的。