科普之友
Year 4
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★科普之友是一个综合的科学信息网站,爱因斯坦相对论,爱因斯坦简介名言故事,牛顿第一定律,牛顿第二定律,牛顿第三定律, 牛顿的故事简介,史蒂芬霍金的故事简介资料, 霍金预言,霍金的宇宙世界。
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