reference的词根为refer，意为：参考
例句
1、
The library contains many popular works of reference.
这家图书馆藏有许多常用的参考书。
2、
There is a list of references at the end of each chapter.
每一章的后面都有一组参考书目。
3、
Keep the list of numbers near the phone for easy reference.
把电话号码表放在电话旁边，方便查找。
