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the largest craters have been erased by the flow of the icy

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the largest craters have been erased by the flow of the icy crust over geologic time.5097
the largest craters have been erased by the flow of the icy crust over geologic time.5097
这句话的大概意思我明白:这最大的陨石坑被抹去通过冰壳的流动over地质时期。这里over怎么翻译
the largest craters have been erased by the flow of the icy
经过相当长时间的地质演化,最大的陨坑已经被流动的冰壳所抹去.
over time本是一个词组,意思就是久而久之或者经过相当长的时间.这里加了geologic应该就翻译成经过相当长时间的地质演化.