每日商务英语 第761期:缺乏自信

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diffident ———— 缺乏自信（形容词）

英文释义
(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.
我的年轻助理很聪明，但是缺乏自信，需要我不断鼓励，才能畅所欲言，分享他的见解。