468。 I am deeply interested in your graduate school in the Department of。。。, and plan to apply for admission。
本句型是申请入学信件的开头，开门见山地表明了感兴趣的院系。其中的graduate school指的是“研究生院”。如果想申请在某一大学读本科的话，应当将graduate school替换为college或者university。
I am..., the Chinese applicant who desires to pursue my Ph.D. study in your honored program.
I am writing in the hope that I may obtain an opportunity to further my study in Applied Physics toward Master degree in your university.
I shall appreciate any favorable action you might take in admitting me to your college.