The Indus Valley civilization appears to have collapsed because natural disaster altered the course of the Indus River.
印度河流域文明看来是因为自然灾害，使得印度河改变了河道而倒塌。
The Indus Valley civilization appears to have collapsed because natural disaster altered the course of the Indus River.
印度河流域文明看来是因为自然灾害，使得印度河改变了河道而倒塌。
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