开启阀门A从排气软管处排出空气。
这些玻璃或塑料罐子被放置在皮肤上，然后利用抽吸装置排出空气，这会造成密封。
The glass or plastic cups are placed on the skin, and the suction device removes air. This creates a tight seal.
针筒的填充利用在填充针筒之前从填充管排出空气的填充程序可以以更快的速率执行。
The filling of a syringe can be performed at a faster rate using a filling sequence which expels air from the fill tube before filling the syringe.
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