第四纪始于几百万年以前，并延续到现在。
The Quaternary glaciation started just a few million years ago – and is still going on.
世界上大多数的火山都是几百万年以前形成的。地球上最年轻的火山在墨西哥的帕里库廷附近。
Most of the world's volcanoes were formed several million years ago. (3) The earth's newest volcano is located near Paricutin, Mexico.
在以前的大规模灭绝之后，地球要花上几十万到几百万年的时间才能重新实现物种多样化。
In previous extinction events it took hundreds of thousands to millions of years for the planet to re-diversify.
在以前的大规模灭绝之后，地球要花上几十万到几百万年的时间才能重新实现物种多样化。
In previous extinction events it took hundreds of thousands to millions of years for the planet to re-diversify.
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