我想了解一下退税的程序，可以吗？
B:There is a detailed introduction on that board.Please have a look at it.
在那个公告板上有详细的介绍，请您自己去看看。
A:Can you tell me how to draw back the duties,please?
请问你能告诉我如何办理退税吗？
B:Sorry,I don't know.
很抱歉，我不知道。