a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level 同义词：safety valve, relief valve, escape cock, escape,
例句与用法
1.
Water system . core of manifold air - escape valve 水系统.集中放气阀芯
2.
Speed control valve shuttle valve rapid escape valve 梭阀快排阀
3.
China moved last year from being a massive importer of steel to being a modest net exporter providing a temporary escape valve for domestic producers 去年，中国从一个钢铁进口大国转变为中等净出口国，为国内生产商提供了临时的“减压阀” 。
4.
Even if the true number is much higher , this is only the smallest of escape valves in the great political pressure - cooker that is china ' s troubled countryside 即便真实数字要远高于此，这也只是这个巨大的政治高压锅- -问题重重的中国农村- -上面最小的一个放气筏罢了。
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