Although rare, mass extinctions change the course of history like nothing else. 大规模灭绝虽然罕见 但会极大地改变历史的进程
the warm, wet conditions in which they had thrived began to change. 曾令它们兴旺发展的暖湿条件 开始发生变化
Its impact will change the world forever... 撞击将永远改变世界
...on a day that would change the course of history. 这一天将改变历史的进程
But one group embraced this change in plant life... 但有一群生物 拥抱了这种植物生态的变化
it was much larger reptiles who would change the course of history. 即将改变历史进程的 是更大的爬行动物
another group of animals were undergoing their own radical change. 另一群动物正在经历巨变
that would change the landscape forever. 将永远改变陆地的样貌