然而，近期粮食涨价部分原因是由于生产生物燃料的粮食产量增加，伤害到城市贫民的实际收入。
However, the recent increase in grain prices - partly due to increased grain production for biofuels - is hurting real incomes among the urban poor.
而美国人在收入增加以后，往往会从城市搬到郊区去住。
As their incomes grow, Americans tend to move from the cities to the suburbs.
皮尤报告还展示各个城市如何增加收入。
The Pew report also looked at how cities are generating revenue.
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