take a leaf out of someone's book
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take a leaf out of someone's book
leaf 叶子，用以书写的撕下的叶子，一本儿书的一页。1570年代有了turn over a (new) leaf的表达，指翻开新的一页。1660年代，leaf作为动词有了翻页的意思。take a leaf out of someone's book暗指故意破坏，从书上撕下一页或嫖窃抄袭他人的作品。
If you take a leaf or page out of someone's
book，you copy them, usually because
they were successful when they acted in that way.你模仿、复制，因为他们那样做时是成功的。
If you are having difficulty with the children,take a leaf out of Mary's book. She knows how to control them.如果你和孩子相处有困难，学学Mary，她知道如何掌控他们。
When you act like that，you're taking a leaf out of your sister's book， and I don't like it！You'd better do it your way.当你那样做时，你是在学你姐姐的样子。我不喜欢这样，你最好按你的方式做。
Don't take a leaf out of my book. I don't do it well.不要学我，我做得不好。