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Genetic hitchhiking or genetic draft is the process by which

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Genetic hitchhiking or genetic draft is the process by which an allele may increase in frequency by
请问这里的by which是个什么用法,by指的是什么?
很高兴为您解答!
by which是定语从句修饰先行词the process ,by表示通过用什么工具,which相当于the process
by the process“通过这个程序”
希望可以帮到您,