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复时间 2022-06-07 2025-04-12 Early Domestication and Agriculture     To some extent, the causes of agriculture are to be found in the thousands of years of hunting-ga...

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The Nile River Valley Though the verdant green course of the Nile Valley appears to be the very antithesis of the bleached Saharan sands through which it flows, these two contras...

Life on Mars Astronomers strongly suspect that Mars currently has no liquid water, diminishing the chances for life there now. But running water and a denser atmosphere in the pas...

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