国外访学导师证明信 外导证明信
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To whom it may concern
The purpose of the letter is to certify that Mr. xx has been visiting my laboratory as a visiting scholar starting from 10 September 2014 to 10 September 2015 in the Department of Civil Engineering and Engineering Mechanics, Columbia University in the City of New York. During this period, Mr. xx has been working on the xxx xxxx. He has completed the research well and been a valuable member of my research group. His English proficiency and research level has been improved substantially during his stay. I expect that he will continue to have a productive career.
Please let me know if you have any question.
Sincerely yours,
(signature)
XX, Professor
Department of Civil Engineering and Engineering Mechanics, Columbia University
Address: xx
E-mail: xx