I got interested in that particular question because one of our former PHD students who is now at Texas A&M, asked me to give a lecture on that subject in honor of some anniversary of the universities.
我对这个问题也感兴趣,因为我们学校的一名博士毕业生,现在在德克萨斯农工大学,请我就这个话题演讲,当时是大学的周年纪念日。
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