SSS 2012-07-30

The London Olympics are about to begin, and spectators will again be riveted by feats that would have been impossible when the modern Olympics began in 1894. Jaw-dropping records are attainable in part because of the advances in materials science. Ne

发表于:2018-12-24 / 阅读(65) / 评论(0) 分类 Scientific American(七)月
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