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Thousands of years ago, humans domesticated every possible large wild mammal species fulfilling all those criteria and worth domesticating, with the result that there have been no valuable additions of domestic animals in recent times, despite the efforts of modern science.

几千年前，人类驯养了所有可能的大型野生哺乳动物，满足了所有这些标准，值得驯养。结果，尽管现代科学做出了努力，但在最近的时间里，没有任何有价值的家畜的增加。

— Jared Diamond 戴蒙德