Even after we evolved the ability to use weapons and became predators ourselves, this ancient brain circuit still offered a useful defense against members of our own species.
即使进化到更够使用武器，自身也变成了捕食者，这些大脑中的古老神经回路仍然提供了一种针对其他人类行之有效的防御手段。
Shanhaiguan full attention to the layout of the ancient city of her military defense capabilities, the unique situation in the seven-city chain a unique identity.
山海关的古城布局充分注意了她的军事防御功能，独特的七城连环局势别树一帜。
Well preserved in China, the thick and strong city wall and the moat of Xi 'an were significant defense structures of the ancient capital of Tang dynasty.
坚实的城墙及宽阔的护城河是唐朝首都的重要防卫工事。西安古城墙及护城河是中国保存较为完好的古代建筑之一。
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