If you want the book to be categorized, either by a bookseller or a library, it has to be assigned a unique numerical code, like an ISBN, for International Standard book Number.

如果这本书需要能够被书商或是图书馆分类，它还需要一个独一无二的数字代码，例如ISBN(国际标准图书号)。

youdao

If you want the book to be categorized, either by a bookseller or a library, it has to be assigned a unique numerical code, like an ISBN, for International Standard book Number.

如果这本书需要能够被书商或是图书馆分类，它还需要一个独一无二的数字代码，例如ISBN(国际标准图书号)。

youdao