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\/>\n\\frac{\\partial T}{\\partial t} = \\alpha \\nabla^2 T<br \/>\n\\]\n<p>\u8fd9\u91cc\uff0c<em>T<\/em> \u8868\u793a\u6e29\u5ea6\uff0c<em>\\alpha<\/em> \u662f\u70ed\u6269\u6563\u7cfb\u6570\uff0c<em>t<\/em> 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