它主要用来抽除空气和其它无腐蚀，不溶于水，含有少量固体颗粒的气体，以便在密闭容器中形成真空。
It is mainly used for extraction of air and other non-corrosive, does not dissolve in water, containing a small amount of solid particles of the gas in order to form a vacuum sealed container.
它主要用来抽除空气和其它无腐蚀，不溶于水，含有少量固体颗粒的气体，以便在密闭容器中形成真空。
It is mainly used for extraction of air and other non-corrosive, does not dissolve in water, containing a small amount of solid particles of the gas in order to form a vacuum sealed container.
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