1-- Excuse me. Can you help me?

2-- Certainly. What can I do for you?

1-- I need to purchase a sweater.

2-- What is your size?

1-- Medium should be fine.

2-- Is this one okay?

1-- Hmm. Can I try it on somewhere?

2-- The fitting room is in the left corner.

===================================

注解：

1.Certainly当然

2.purchase购买   

3.somewhere在某处

===================================

译文：

1--打扰下，你能帮助我吗？

2--当然可以，你需要什么？

1--我需要买件毛衣。

2--你穿多大尺寸的？

1--中号就行了。

2--这件行吗？

1--我能试穿下吗？

2--试衣间在左边的拐角。