After decades of emigration and decline, Poland's Jewish population is growing again, as children sheltered in secret by gentile families during the war rediscover their roots.

移民数量在经历了几十年的下降之后，波兰犹太人的数量开始增加，因为很多得到好心人帮助幸免于难的犹太儿童开始寻根之旅。

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It has been proved that structure of food chain, immigration and emigration, environment noise can influence the pattern of complex population dynamics.

研究表明食物链的结构、种群的迁入和迁出、环境噪音都会对种群的复杂性动态特征产生影响。

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Out-of-control population growth and an endless exodus to the northn Net emigration is down to zero, if not negative, and the fertility rate will soon be lower than that of the United States.

那个“人口增长失控，大量人群北迁”的墨西哥也已不复存在——墨西哥的净移民数（出境移民减去入境移民的结果，译者注）不计负数已减少至零，其出生率也即将低于美国。

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While some (though certainly not all) of the population losses in Estonia and Latvia can be attributed to the emigration of ethnic Russians, no such explanation is possible for Bulgaria, Romania, or Lithuania (which unlike the other Baltics never had a sizable ethnic Russian population).

FORBES: Russia's Population Decline in Regional Perspective

After decades of emigration and decline, Poland's Jewish population is growing again, as children sheltered in secret by gentile families during the war rediscover their roots.

ECONOMIST: New thinking and old wounds around the Auschwitz death camp

Thanks partly to the Irish diaspora, created by a century and a half of emigration, the country has far more clout than its small population might suggest.

ECONOMIST: The luck of the Irish