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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.
    • 釋義
    • 相關詞

    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