为了建立这样一个年表，有必要确定地球过去不同时期存在的陆冰的相对数量。
To establish such a chronology, it is necessary to determine the relative amounts of land ice that existed at various times in the Earth's past.
这种物质覆盖的区域十分巨大，因此使其沉积下来的冰一定是比格陵兰岛或南极洲更大的大陆冰川。
The areas covered by this material were so vast that the ice that deposited it must have been a continental glacier larger than Greenland or Antarctica.
最后，阿加西和其他人说服了地质学家和普通大众，一个巨大的大陆冰川作用已经把极地冰帽延伸到了现在享受温带气候的地区。
Eventually, Agassiz and others convinced geologists and the general public that a great continental glaciation had extended the polar ice caps far into regions that now enjoy temperate climates.
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