有点难想象,东周和隋唐的温暖期,年平均气温还要比现在高上几度的那个时代,淮河乃至长江以南地区的居住宜人性有多低…

by @志达 #无用但有趣的冷知识 https://t.co/ZFdjc2y5Lz

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