Jeffrey Passel, a demographer at the Pew Hispanic Centre, estimates that the number of illegal immigrants in America fell by 500,000 between 2007 and 2008.

皮尤西班牙裔研究中心(Pew Hispanic Centre)的人口学家杰弗里•帕赛尔(Jeffrey Passel)预计2007至2008年间美国非法移民的数量下降了50万人。

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"The face of the country is changing, " said Jeffrey Passel, demographer at the Pew Hispanic Center.

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Their number grows by at least 500, 000 a year, reckons Jeffrey Passel of the Urban Institute.

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