safety-valve
n
1 valve that releases pressure in a steam boiler, etc when it becomes too great 安全阀. => illus at pan 见 pan 插图.
2 (fig 比喻) way of releasing feelings of anger, resentment, etc harmlessly （无害地）发泄怒气、 怨恨等的方式
My hobby is a good safety-valve for the tension that builds up at work. 我用业余爱好来消除工作中产生的紧张情绪.