In the much more distant past, other ice ages have occurred.
在更久远的过去，其他冰河时代也曾发生过这种情况。
在冰河时代。
Ice ages come in slowly, but go out with a bang.
冰河时代来的很慢，但却走的很快。
Smith said Mars has ice ages, just like Earth has had.
史密斯表示火星也和地球一样有过冰河时期。
There have been at least four major ice ages in the Earth's past.
至少有四个主要的冰河，在地球的过去。
We have had warm periods and little ice ages; but the changes have been small.
我们有过暖期和小冰期；但是变化很小。
We have had warm periods and little ice ages; but the changes have been small.
我们有过暖期和小冰期；但是变化很小。
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