Dear Dr.XXXI am very fortunate that both your Institute and Stanford give me offer at last. However, it proses to me a very hard problem of choosing indeed, for both are my favorites. I also so know many professors at Stanford come from Rochester such as Professor XXXX.After careful thought and with great reget, I must say I would go Stanford University to further my academic career for several reasons that convince me at last. One of them is Stanford ranks NO.

　　1 in Phys., E.E.,Graduate School..., which provides with me much more opportunities to be excellent in many potential fields though its optics is not as stronge as Rochester which ranks 1st in Optical Engineering in the world.

　　Another reason is my best friend I ever had is in the CS department of Stanford Univerity and I really hope to be his schoolmate after a departure of 8 years and 20000 kilometers.But here, I still want express again my deep gratefulness to your offer and warm welcome. I hope and am sure we will have opportunite to cooperate in the future.Sincerely yours,XXX