星级典句：

第一句:May I know the procedure of tax-refund,please?

我想了解一下退税的程序，可以吗？

A:May I know the procedure of tax-refund,please?

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。

第二句: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？

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。