This valve allows the cylinder to contain gases and allows gas to be filled into or emptied from the cylinder.

这个阀门使钢瓶可以容纳气体，允许气体灌装进或提取出钢瓶。

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This valve allows the cylinder to contain gases and allows gas to be filled into or emptied from the cylinder.

这个阀门使钢瓶可以容纳气体，允许气体灌装进或提取出钢瓶。

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