在选择确定过去存在的气候条件的方法时，古气候学家援引了四个主要标准。
In choosing a method for determining climatic conditions that existed in the past, paleoclimatologists invoke four principal criteria.
因而许多气候学家使用气候模式进一步研究，发现在古气候记录与轨道参数变化之间具有显著关系；
Thus, many climatologists have made further investigations in terms of climatic models and found significant correlation between paleoclimatic records and orbital parameter variations.
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