参考答案：
Reference writing

Dear Mr. Smith,

I am Mark Zhang and we met each other at Guangzhou Trade Fair. To be frank, I am very interested in the new mobile phones displayed by your company.

I am writing to ask for some specific information about your mobile phones. Would you please let me know something about the specification, colors, prices and of course the functions? I believe your mobile phones will make its way in the mobile phone market.

If possible, I’d like to build a long-term business relationship with your company. I am looking forward to getting your reply.

Yours truly,
Mark Zhang