【正文】
am pleased to ply with his request.i have known mr. ren since 1991, when he was admitted as a master of engineering candidate into the institute. as his research adviser, i directed his research and found him a promising youth radiating with intelligence and creativity. during his first year, he got a very good record in major courses. he particularly enjoyed challenging areas of studies such as artificial intelligence and neural network.during the following two years, mr. ren worked on a munication project for his degree thesis the radio shunting system on railroad. to make the product meet the actual needs, he faced down many practical problems, such as high reliability and volume and weight of the product. working hard