The engines shut off automatically in an emergency.

遇到紧急情况发动机便自动停止工作。

《牛津词典》

Emergency Fuel Shut Off Valve.

燃油紧急关闭阀门。

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Caution: Do not shut off gas unless an emergency exists. If gas is ever turned off, a professional must restore service.

注意：除非紧急状况，不要关闭燃气。如果关闭燃气，必须由专业人员来重新打开阀门。

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In addition, he said, blowout preventers the giant emergency shut-off valves that failed on the Deepwater Horizon are located aboard drilling rigs in shallow-water operations, not on the seafloor.

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As temperatures soared to the triple-digits for the 37th consecutive day Sunday, city officials made an emergency decision to shut off the town's water supply.

CNN: Heat wave: Oklahoma, Texas endure warmest months on record