escape valve

基本解釋

China needs an escape valve.
中國(guó)需要一個(gè)“放氣閥”。
www.common-talk.com
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.
他長(zhǎng)期以來(lái)保持著對(duì)文明終結(jié)的藝術(shù)性想象，這是一種情感和精神的宣泄形式，竝以此表達(dá)自我。
The engineer opened the safety valve to allow the steam to escape and so reduce the pressure.
手輪、手柄和扳手傳動(dòng)以及安全閥、減壓閥、疏水閥省略本代號(hào)。

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
Note the caveat: there must be an escape valve.
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?