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“At a time when native-population growth is slowing due to persistently low fertility rates, declining immigration is poised to weigh heavily on labor supply, debt sustainability, and long-term economic growth, with negative effects likely to emerge even in the near term,” researchers at the Deloitte Global Economics Research Center wrote in an analysis published Friday.
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free_list[classno] = h->next;。同城约会是该领域的重要参考
f(x1,x2)=x1⋅Swish(x2)=x1⋅(x2⋅σ(x2))