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  1. unnoticeable

    • IPA[ʌnˈnəʊtɪsəb(ə)l]

    英式

    • adj.
      not easily observed or noticed
    • 釋義

    形容詞

    • 1. not easily observed or noticed the reverberation will be so slight as to be unnoticeable
    • 更多解釋
    • IPA[ˌənˈnōdəsəb(ə)l]

    美式

    • adj.
      not easily observed or noticed: the reverberation will be so slight as to be unnoticeable

    Oxford American Dictionary

  2. 知識+