unit 309 购买教课书

dialogue 
英语情景对话

A:Can you help me find my books?
A:你能帮我找到我要的书吗？

B:Certainly, do you have your school schedule? The books are arranged by course number and instructor.
B:可以，你有没有带课程表？所有的书都是按照课程编号和任课老师排序的。

A:Oh, I see. Thank you.
A:哦，我明白了，谢谢。