Vacuum packaging is produced by pumping all the air out of the package. 真空的包装都是用抽气机把空气抽出的。
In order to achieve this boost, the turbocharger uses the exhaust flow from the engine to spin a turbine, which in turn spins an air pump. 为了获得这种性能的提升，涡轮增压机使用发动机排除的废气带动涡轮旋转，涡轮是一种旋转式的空气泵。
