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.
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.
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。
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