A: Excuse me. Could you help me with something?
打扰下，你能帮我找下东西吗？

B: I'll certainly try.
我当然能帮你。

A: I'm looking for a nice sweater.
我正在找一件漂亮的毛衣。

B: What size do you wear in a sweater?
你穿什么尺寸的？

A: Medium is my size for shirts and sweaters.
我穿的衬衫和毛衣都是中号的。

B: Here's a medium. What do you think?
这件是中号的。你认为如何？

A: I like it. Where can I try it on?
我很喜欢。我去哪儿能试下衣服？

B: We have a large fitting room in that corner.
那边角落里有试衣间。