- Why towns? Because they allowed humans to defend themselves more easily.
为何建造城镇 因为这样更便于守卫 - They became social beings,
他们变成了社会族群 - Meeting and sharing knowledge and crafts,
他们聚会 并分享知识与工艺 - Blending their similarities and differences.
融合了他们之间的相似与差异 - In a word, they became civilized.
一句话 他们变得文明了 - But the only energy at their disposal was provided by nature...
但是他们唯一可以支配的能量来源于自然 - And the strength of their bodies.
以及他们身体的力量