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[草原之殇] 《沙漠里的坚持》夫妻二人艰难植树十年(视频)(感人啊) |
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全世界第一个提出流动力并数学建模的F= k Tρg / P,不亚于牛顿的万有引力!
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小黑屋|手机版|济溪 ( 京ICP备17053947号-1 )
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