safety valve
noun [ C ] uk/ˈseɪf.ti ˌvælv/ us/ˈseɪf.ti ˌvælv/
(MACHINE)
安全阀
a small part on a machine that allows steam or gas to escape if the pressure inside the machine becomes too high
(FEELINGS)
发泄情绪的途径，疏导情绪的方法
a way of getting rid of strong feelings without causing harm
For many people who suffer from stress at work, sport is a vital safety valve. 对许多承受工作压力的人来说，体育运动是一个重要的减压方法。