书也有两个重要的号码喔，一个是分 类号，一个是作者号，合起来就是「索书号( Call numbers )。索书号的功能就是 将书依照号码由小排到大，由左到右边排好队，这样找书才找的到喔！
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N the number given to a book in a library, indicating its shelf location 图书馆书目编号 (Also called call mark)
Indeed, work with some other species suggests they too can refine their quantitative thought if they are introduced to the cognitive power tools we call numbers.
事实上，对其他一些物种的研究表明，如果引入我们称之为数字的认知工具，它们也可以完善自己的定量思维。
The books are shelved by call Numbers.
书本都按索书号码装架。
He gave me a pamphlet for my call Numbers.
他给了我一个小册子记录电话号码。
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