Such is the role of chance in the history of life on our planet. 这就是机遇在地球生命历史中 所扮演的角色

330. Land, air, and sea.
     陆地 天空 海洋
331. The asteroid strike had allowed the mammals to go from lowly underdogs...
     小行星撞击 使哺乳动物从卑微的弱者…
332. to become a global power.
     变成了世界霸主
333. Such is the role of chance in the history of life on our planet.
     这就是机遇在地球生命历史中 所扮演的角色
334. But there is one more chapter in the mammal story still to be told.
     但是哺乳动物的故事 还有一章仍待讲述
335. Two and a half million years ago,
     250万年前
336. the mammals were faced with a new challenge.
     哺乳动物面临一个新的挑战

来自《我们星球上的生命 第一季 第七集 Life on Our Planet S01E07 地球继承者》第 333 行