On the far side, the wall was almost a kilometer high... 在远端 这堵墙有近1000米高
The only thing stopping the water from flooding the land to the west 阻止水流向西淹没陆地的
In North America, the meltwater formed an enormous glacial lake 在北美 融水形成一个巨大的冰川湖
The ice began to melt as Earth's orbit shifted once more 随着地球轨道再次发生变化 冰开始融化
The buildup of ice in the north affected the climate across the planet. 北方冰冻影响全球气候
To overcome the challenges of a more hostile world, 为了克服恶劣环境所带来的挑战
Life on the ground is more dangerous... 地上的生活更危险
The descent from the treetops to a life on the forest floor. 从树上下到森林地面生活