老师平时很严肃,但下课后就会放松下来和学生们聊天。

The teacher is usually strict, but after class she unbends and chats with students.

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The teacher is usually strict, but after class she unbends and chats with students.

unbends 是动词 unbend 的第三人称单数现在时形式。unbend 由前缀 un-(表示"相反")和动词 bend(弯曲)组成,字面意思是"伸直",引申为"放松、变得随和",指从严肃或紧张的状态中放松下来。

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