每日商務英語 第504期:不認真的

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half-hearted--------不認真的（形容詞）

英文釋義
(adjective) Having no enthusiasm; lacking interest or energy.

例句
My son practices the piano for an hour every day in a half-hearted manner because he would rather play outside with his friends.
我的兒子每天很不認真地練一個小時鋼琴，因爲他更喜歡和朋友們出去玩。