freed humans from their toil on the land. 将人类从耕种土地上解放出来
Humans deploy prodigious efforts to mark a few arid acres... 人类会做出惊人的努力
The principal daily concern of all humans... 所有人类日常首要关心的
Humans harnessed the energy of animal species and plant life, 人类驾驭了动物的力量以及植物的生命
Humans tried to extend the frontiers of their territory, 人类试图拓宽疆土
For a long time, the relationship between humans and the planet... 很长一段时间里 人类和地球的关系
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
And thanks to a more clement climate, humans settled down. 多亏更加温和的气候 人类定居了下来