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1.The object of providing the safety valve is to allow excess pressure to escape.
装备安全阀是为了让过高的压力外逸。收藏指正
2.a valve through which burned gases from a cylinder escape into the exhaust manifold.
通过来自汽缸的燃烧废气进入排气集管的阀。收藏指正
3.The engineer opened the safety valve to allow the steam to escape and so reduce the pressure.
工程师打开安全阀让蒸气外逸以便降低压力。收藏指正
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