她捡起书,小心地把它们放回书架上。

She picked up the books and carefully replaced them on the shelf.

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She picked up the books and carefully replaced them on the shelf.

replaced 是动词 replace 的过去式,replace 由前缀 re-(表示"重新、再次")和动词 place(放置)组成,字面意思是"重新放置",即"放回原处"或"替换"。

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