每日商務英語 第761期:缺乏自信

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diffident ———— 缺乏自信（形容詞）

英文釋義
(adjective) Lacking the confidence to express one's own ideas; timid.

例句
My brilliant but diffident young assistant needs constant encouragement from me to speak up and share his insights.
我的年輕助理很聰明，但是缺乏自信，需要我不斷鼓勵，才能暢所欲言，分享他的見解。