印媒：900年的干旱摧毁了印度河流域的文明
year drought wiped out Indus civilisation: IIT-Kharagpur印度理工学院：900年的干旱摧毁了印度河流域的文明KHARAGPUR: The Indus Valley civilisation was wiped out 4,35...
Quora：为何中国如此不文明？
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