美国一直是一个流动性很强的国家，但美国人口普查局的最新数据显示，美国的人口流动率已降至有记录以来的最低水平。
The US has always been a remarkably mobile country, but new data from the Census Bureau indicate that mobility has reached its lowest level in recorded history.
与此形成鲜明对比的是2000年到2001年。人口流动率从15%以上降至不到14%。
Between 2000 and 2001, in contrast, the migration rate fell from over 15% to under 14%.
2008年的人口流动率只有不到12%，州间流动率跌倒1.6%，不到战后数十年水平的一半。
In 2008 the domestic migration rate was just under 12%, and the rate of migration between states fell to 1.6%-less than half the level that prevailed in the post-war decades.
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