On June 27th, 2011, The 31st Lecture of Mechanical Science and Engineering Development BBS was successfully given by Professor Chen Wei from the Department of Mechanical Engineering in Evans's Northwestern University Campus USA. The lecture was held by Professor Fu Xin. Many teachers such as Wang Jiugen, Liu Zhenyu and Xiang Shufang attended the lecture and listened carefully with a great many of doctors, postgraduates and university students.