三层书架书籍数量布局
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A wooden bookshelf consisting of 【three】 shelves: On the top shelf, there should be 【one】 book, on the second shelf, there should be 【three】 books, and on the bottom shelf, there should be seven books.

A wooden bookshelf consisting of 【three】 shelves: On the top shelf, there should be 【one】 book, on the second shelf, there should be 【three】 books, and on the bottom shelf, there should be seven books.