Open needle valve "B" and vent or bypass needle valve, bleeding to atmosphere, then closing needle valve "B" restores the system to a normal static condition.
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bleeding to atmosphere
向大气中渗血
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Open needle valve "b" and vent or bypass needle valve, bleeding to atmosphere, then closing needle valve "b" restores the system to a normal static condition.
开启针形阀“B”和排气或旁路针形阀，排放到大气中，然后关闭针形阀“B”，将系统恢复到正常的静止状态。
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