问题描述：
英语翻译
When migration from state i to state j is not
very common,any past migrant has a large,positive,effect on the probability of
others migrating because he/she offers new information and resources about j
that were not available in i.
When migration from state i to state j is not
very common,any past migrant has a large,positive,effect on the probability of
others migrating because he/she offers new information and resources about j
that were not available in i.
问题解答：
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