到本世纪中叶，冰河时代的破坏力将难以想象。
An ice age by mid-century would be unimaginably devastating.
来自岩心上部的发现证实了科学家们已经知道的情况：最后一个冰河时代的气候变化非常快。
Findings from the upper sections of the cores have confirmed what scientists already knew—climate during the last ice age fluctuated rapidly.
有一段时间，这一理论被认为是不可检验的，主要是因为没有足够精确的冰河时代的年表与轨道的变化相匹配。
For sometime this theory was considered untestable, largely because there was no sufficiently precise chronology of the ice ages with which the orbital variations could be matched.
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