safety-valve
n
1 valve that releases pressure in a steam boiler, etc when it becomes too great 安全閥. => illus at pan 見 pan 插圖.
2 (fig 比喻) way of releasing feelings of anger, resentment, etc harmlessly (無害地)發泄怒氣、 怨恨等的方式
My hobby is a good safety-valve for the tension that builds up at work. 我用業余愛好來消除工作中產生的緊張情緒.