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  1. safety valve

    英式

    • n.
      a valve that opens automatically to relieve excessive pressure.;a means of giving harmless vent to feelings of tension or stress
    • noun: safety valve, plural noun: safety valves

    • 釋義

    名詞

    • 1. a valve that opens automatically to relieve excessive pressure.
    • a means of giving harmless vent to feelings of tension or stress laughter may be a safety valve that reduces tension
  2. 知識+