Thank you very much for all the help and encouragement you have offered to me. I regret to inform you that I have to withdraw my application to 。。。 University.
It was a difficult and painful decision. 。。。 is an excellent university and your lab perfectly matches my interests and I really look forward to working there. However, I received an offer of admission from the 。。。. I applied to 。。。 before I got the informal offer from you. After careful consideration and comparison these days, I think 。。。 better fits my academic and career goals.
Thanks again for your help and hope we could have a chance to work together in the future.