索书号的英文：
call number

参考例句：

The call numbers are in the upper left corner of the cards.
索书号码在卡片的左上角。

call是什么意思：
v. 把...叫做；认为...是；打电话叫；大声呼叫；召唤；打电话；访问
n. 打电话；通话；短暂拜访；请求；呼吁；召唤；呼唤

call upon; call on
应用;访问;号召;呼吁

This is called wow.
这叫作“音幅失真”。

It was called the Restoration.
这就是所谓的王政复辟。

A call to WSALookupServiceEnd was made while this call was still processing. The call has been canceled.
在该调用还处于处理中时，就调用了WSALookupServiceEnd。该调用被取消。

Friends are lost by calling often and calling seldom
交往过密过疏,都会失去朋友

number是什么意思：
n. 数；号码；算数
v. 给…编号；计算，数

The number was fifty.
该数字为五十。

There is safety in numbers
人多势众

It was an irrational number.
这是一个无理数。

Which number on the card is a prime number?
在卡片上哪一个数字是最初的数字？

The number raised to the logarithm of a designated number in order to produce that designated number.
被升到指定数字的对数上的数量,是为了得到那被指定的数目。