Zhang Chun is the classmate of a friend of mine in Beijing.
张淳是我一个北京朋友的同学。
Chen Chun (Editor). 1998. Atlas of Study on Backgrond Value of Aquatic Environment of the Changjiang River Valley, Science Press, Beijing.
陈春(编者). 1998。长江流域水体环境背景值研究图集，科学出版社，北京。
Chenxu Di, Chun Yuan Department of Computer Science and Technology, Tsinghua University, Beijing 100086, China.
清华大学计算机科学与技术系计算机学院；
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