在美国期间,钱学森仅仅为了解决一道薄壳变形的难题,研究的手稿就累积了厚厚一大摞,在工作进展到五百多页时,他的自我感觉是:“不满意!”直到八百多页时,才长舒一口气.他把手稿装进牛皮纸信封,在外面写上“Final”(最后的定稿),继而觉得不妥,又在旁边添上一句“:Nothing is final!!!”(在科学上没有最后!).这表明学无止境,人类对科学的探求是永无终点的.在本期,同学们将学到有4000多年历史的勾股定理,伟大的勾股定理成为人类智慧 In the United States, Qian Xuesen just to solve the problem of a shell deformation, the study of the manuscript accumulated a large pile, in the work progress to more than 500 pages, his self-feeling is: “not satisfied!” It was not until he was over 800. He put the manuscript into the envelope of kraft paper and wrote “Final” (final version) out of the envelope, then went wrong, adding a “: Nothing is final !!! ”(There is no last in science!) This shows that there is no end to learning, human exploration of science is never ending.In this issue, students will learn more than 4,000 years of history of the Pythagorean theorem The great Pythagorean Theorem becomes human wisdom