当冰河时代开始时，大陆上的冰原逐渐增大，从海洋中蒸发出来的水逐渐减少，而这些水最终又会回到陆地上。

When an ice age begins, the continental ice sheets grow, steadily reducing the amount of water evaporated from the ocean that will eventually return to it.

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因而它的历史相对最近，从地质条件来看，相对其它冰河时代我们可以更加详尽地研究这一冰河时代。

So its history is relatively recent, in geological terms, and can be studied in far more detail than the others'.

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