A valve that was supposed to be open, to allow the heat and steam to escape, was closed.

一个本应打开的阀门被关上了，这个阀门控制着热量和蒸汽的泻出。

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He continues a long-standing artistic tradition of imagining the end of civilization, a form of emotional and spiritual escape valve operated since man found a means to express himself.

他长期以来保持着对文明终结的艺术性想象，这是一种情感和精神的宣泄形式，并以此表达自我。

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Since cordite burns at a greater rate at a higher pressure a relief valve must be used to allow generated gas to escape to atmosphere at times when the demand is low.

因为柯达火药在较高的压力下以较高的速度燃烧，所以必须使用一个溢流阀，以便当用气少时，能让所产生的部分气体排到大气中去。

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The proposed New York legislation includes an escape valve, but it requires a super-majority vote (60%) to raise taxes by more than 2% in a year.

FORBES: Property Tax Caps and Local Governance

They do not have the safety-valve of banking books, where souring assets can escape the rigours of mark-to-market accounting.

ECONOMIST: Investment banking: Is there a future? | The

As a result, shareholders gave CEOs an escape valve that, the reasoning went, would encourage them to work in the long-term interests of their companies.

WSJ: In Defense of the CEO