using medicine to save another's life. 动物界只此一家
but it leads a very different, mainly plant-eating life. 但过着 非常不同的、以植物为主食的生活
taking advantage of this new wave of life. 利用新的生命浪潮
...in ways that would revolutionize life on Earth. 这样的改变将为地球上的生物 带来革命性的变化
Since life first emerged on planet Earth, 自从生命首次在地球上出现
The youngsters start life much like other reptiles. 幼崽开始生活 与其他爬行动物非常相似
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
the forces of nature would send the story of life in a completely new direction. 自然的力量 会将生命的故事带向一个全新的方向
but one that spends its entire life at sea. 但一辈子在海中生活
This is an echo of what life was like back in the Triassic. 这是三叠纪时期生活的历史回声