什么是向前追溯，什么是向后追溯？
科学研究，迟早总归要碰上某种再也不能向后追溯的东西，这种柬西，显得不是其他东西正常的或必然的衍生物。这种东西就是最后设定。
Scientific research sooner or later, but inevitably, encounters something ultimately given that it cannot trace back to something else of which it would appear as the regular or necessary derivative.
随着科学家从北极运来更多的沉淀物岩心，波里·亚克及其合作者想了解更多过去冰范围的详细信息，并将此类信息在时间上进一步向后追溯。
As scientists pull more sediment cores from the Arctic, Polyak and his collaborators want to understand more details of the past ice extent and to push this knowledge further back in time.
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