safety valve

1. N-COUNT A safety valve is a device which allows liquids or gases to escape from a machine when the pressure inside it becomes too great. 安全閥

Residents heard an enormous bang as a safety valve on the boiler failed. 儅鍋爐的一個安全閥失霛時，居民們聽到了一聲巨響。

2. N-COUNT A safety valve is something that allows you to release strong feelings without hurting yourself or others. 釋放壓力的手段

Crying is a natural safety valve. 哭泣是一種自然的釋放壓力的手段。