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2022年09月15日 07:14:1613百度已收录

The pace of evolution can be quite variable, with long periods in which there is little change being punctuated by relatively brief periods of tens of thousands of years in which most changes occur.

其中“ with long periods in which there is little change being punctuated by relatively brief periods of tens of thousands of years in which most changes occur.”如何分析其结构???