书籍要分类而有次序排放在书橱或书架上，有它们固定的位置。

The books should be classified(14), placed on the book shelves, and in their proper places.

youdao

书籍要分类而有次序排放在书橱或书架上，有它们固定的位置。

The books should be classified(14), placed on the book shelves, and in their proper places.

youdao