更新世是一段冰河时代。
在更久远的过去，其他冰河时代也曾发生过这种情况。
In the much more distant past, other ice ages have occurred.
相反，如果另一个冰河时代来临，海平面会急剧下降。
In contrast, should another ice age occur, sea level would drop drastically.
但在冰河时代，这些植物群落实际上一起生长，彼此混杂在一起。
But during the Ice Age, these plant communities actually grew together, mixed with one another.
这个过程是自我延续的，最终导致了冰河时代。
The process was self perpetuating and eventually lead to the Ice Age.
冰河时代来的很慢，但却走的很快。
冰河时代几乎将他们毁灭。
如此反复的，冰河时代恢复然后，寒冷继续。
Again and again, though, the main ice age sheet recovered and the cold continued.
在上一个冰河时代我们的问题是二氧化碳太少。
但是希尔说这并不意味着冰河时代会再度到来。
冰河时代为什么地球没有完全封冻？
但我认为当时冰河时代的客观条件也是极为关键的。
But also I think those Ice Age conditions were critical as well.
强大的火山喷发能否引起另一个冰河时代？
它们适应了寒冷的气候，生活在冰河时代。
They were adapted to cold weather, and lived during the ice age.
为冰河时代做准备！
在冰河时代。
这些人或许认为我们将要进入另一个冰河时代，但是他们只占少数。
Perhaps they believe we will head into another Ice Age, though they are the minority.
这些人或许认为我们将要进入另一个冰河时代，但是他们只占少数。
Perhaps they believe we will head into another Ice Age, though they are the minority.
应用推荐