在外面玩完后,孩子们累了,所以他们的母亲给他们脱了衣服,帮他们上床。

在外面玩完后,孩子们累了,所以他们的母亲给他们脱了衣服,帮他们上床。

After playing outside, the children were tired, so their mother undressed them and helped them into bed.

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After playing outside, the children were tired, so their mother undressed them and helped them into bed.

undressed 是动词 undress 的过去式形式。undress 由前缀 un-(表示"相反、去除"的动作)和动词 dress(穿衣服)组成,字面意思是"脱去衣服",即"给...脱衣服"的动作。

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