The normal blood pressure change with the environment fluctuates in a certain range.

正常人的血压随内外环境变化在一定范围内波动。

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With the application of pressure relief valve, it needs certain time.

由于采用了减压阀，阀门关闭需要时间。

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With the application of pressure relief valve, it needs certain time.

由于采用了减压阀，阀门关闭需要时间。

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