usefulKK [ˋjusfəl] /ˈjusfəl/形容詞1有用的、有幫助的、實用的This app is really useful when you travel abroad.出國旅行時,這個應用程式真的很實用。2有益的、有價值的Her comments on my draft were extremely useful.她對我草稿提出的意見非常有幫助。3能幹的、厲害的英式口語He's a useful player in midfield, especially on defense.他在中場表現相當出色,尤其是防守。