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  1. doubtful

    • IPA[ˈdaʊtfʊl]

    英式

    • adj.
      feeling uncertain about something;not known with certainty
    • 釋義

    形容詞

    • 更多解釋
    • IPA[ˈdoutfəl]

    美式

    • adj.
      feeling uncertain about something: he looked doubtful, but gave a nod I was doubtful of my judgment

    Oxford American Dictionary

  2. 知識+