Sentences often used to write an email message:
1. I have got your email on…..
2. Thank you very much for your email in which you inform me…..
3. I am sorry to inform you that we are unable to provide…..
4. I hope you will consider my application and arrange me an interview.
5. I am looking forward to seeing you here in China.
6. Many thanks and best wishes.

A sample of email
To:
From:
Subject: Possible research opportunity in your lab?

Dear Professor Green Berries,
My name is Cava Jefferson. I am currently a second year undergraduate student here at the University of Virginia and I am planning to major in Biology. I have significant interest in scientific research and I am writing to inquire about a possible research opportunity in your laboratory.
I read your profile on the website and I was intrigued about your field of research of vascular system（血管系统） and angiogenesis(血管生成).
I would like to learn more about your research lab's work and if we are mutually interested。
I understand you are very busy but would it be possible to have a quick chat about research sometime soon if there is space available for research?
In addition, I have an apartment lease that starts in June - therefore, I am available to begin training in your lab this summer.
Thank you and let me know whenever you are available to meet. I would appreciate any assistance you could give me. Thank you again for your time and consideration. Sincerely,
Cava Jefferson