U.S. Senator Chuck Grassley of Iowa chooses to walk rather than ride a Senate subway rail car from the Dirksen Senate Office Building into the Capitol April 5, 2011.

美国爱荷华州参议员 Chuck Grassley 选择步行从迪克森参议办公楼到国会大厦，而非搭乘参议员地铁专列。 拍摄于2011年4月5日。

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Now, the city is expanding subway lines and finishing a rail line from the airport to downtown, but car ownership is expected to keep rising.

现在，这个城市正在扩建地铁，以及一条从机场到市区的轻轨。但是，车辆的增长预计还会持续。

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