杨说，冰川作用在地球的整个发展历史中都有发生，有证据表明它发生在二叠纪末期。
Glaciation, Young claims, has occurred throughout Earth's history, and there is evidence that it occurred toward the end off the Permian period.
哈斯·里安教授说，冰川湖产生的洪水的数量已经急剧的增加了。
The number of floods from glacial lakes already is rising sharply, Professor Hasnain said.
有证据显示说，冰川的进与退都是周期性的，受地球轨道的变化所诱导。
There is some evidence that the ice came and went in regular cycles, driven by changes in Earth's orbit.
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