他的奇怪行为让我感到不安。

His strange behavior unsettled me.

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His strange behavior unsettled me.

unsettled 是动词 unsettle 的过去式。unsettle 由前缀 un-(表示"相反、否定")和动词 settle(安定、解决)组成,字面意思是"使不安定",引申为"使不安、使心神不宁"。

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