The only thing stopping the water from flooding the land to the west 阻止水流向西淹没陆地的
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
and global temperatures began to rise. 全球温度开始上升
But just as life got used to colder, drier conditions, 但就在生命逐渐适应 更寒冷、更干燥的条件时
would lead to one species of primate 有朝一日会导致一种灵长类动物
To overcome the challenges of a more hostile world, 为了克服恶劣环境所带来的挑战
But finding enough food to feed many mouths... 但是为众多家族成员找到足够的食物
The descent from the treetops to a life on the forest floor. 从树上下到森林地面生活
Only desert specialists that had evolved to withstand extreme heat 进化出能承受极端高温的沙漠专家