Primitive society to survive, you must obtain from the nature, and the prey, and the beasts of prey dealing with natural disasters are toughly, is a kind of physical game.

 
  • 原始社会人类要生存,就必须从自然界获取猎物,要与猛禽野兽打交道,与各种自然灾害进行顽强地抗争,是一种体能的博弈。
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