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safety valve

noun
🔊/ˈseɪfti vælv/
🔊/ˈseɪfti vælv/
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  1. a device that lets out steam or pressure in a machine when it becomes too great安全阀Topics Engineeringc2
  2. a way of letting out feelings of anger, excitement, etc. without causing harm疏导（情绪）的方法
    • Exercise is a good safety valve for the tension that builds up at work.锻炼身体是排解工作压力的好办法。🔊🔊