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1. Oxford Dictionary

   self-cancelling

   • adj.
     having elements which contradict or negate one another；(of a mechanical device) designed to stop working automatically when no longer required.
2. • 釋義
   • 相關詞

   adj.

   形容詞

   • 1. having elements which contradict or negate one another some of the speculation had been self-cancelling
   • 2. (of a mechanical device) designed to stop working automatically when no longer required.

   noise-cancelling

   • adj.
     (especially of a pair of headphones) designed to reduce external noise, typically by generating ... I popped on my noise-cancelling headphones and drifted off to sleep

   Oxford Dictionary