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今年１２月１１日是国际著名力学家，我国近代力学的奠基人，我国航天技术的开创者和系统工程科学家，中国力学学会和中国空气动力学学会的创始人，钱学森先生的９０华诞．中国力学学会和中国空气动力学学会等２１个单位举办“新世纪力学研讨会──钱学森技术科学思想的回顾与展望”会议，重温他发展力学的丰富思想，共同探讨我国新世纪力学的前进道路．本期刊出《钱学森先生简介》、郑哲敏院士的《祝贺钱学森院士９０寿辰》以及研讨会的３篇大会报告，以表示对钱学森先生９０华诞的祝贺。
December 11 this year is the famous international mechanics, the founder of modern mechanics in China, China’s space technology pioneer and systems engineering scientist, China Institute of mechanics and China Aerodynamics Society founder, Mr. Qian Xuesen 90 birthday. 21 units such as China Mechanics Society and China Aerodynamics Society held “New Century Mechanics Symposium - Review and Prospect of Qian Hsueshen’s Scientific Thought”, reviewing his rich thinking of development mechanics and discussing the progress of mechanics in the new century in China the way. This issue contains a brief introduction of Mr. Qian Xuesen, academician Zheng Zhemin’s 90th birthday congratulations on Academician Qian Xuesen and three conference reports of the seminar, in order to express his congratulation on Mr. Qian Xuesen’s 90th birthday.