- to become a global power.
变成了世界霸主 - 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 - 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 - Two and a half million years ago,
250万年前 - the mammals were faced with a new challenge.
哺乳动物面临一个新的挑战 - What had been a slow cooling of the planet
过去缓慢的地球降温 - intensified.
加速了
Two and a half million years ago, 250万年前
阅读次数 2
