General Keen says U.S.troops are working to assume more responsibility for aid distribution, which will allow U.N.peacekeepers in Haiti to focus on security concerns.

VOA: standard.2010.01.18

The districts back in 1913 represented the population distribution of the U.S. at that time.

913年划分的区域代表着,当时美国人口的分布。

耶鲁公开课 - 金融市场课程节选

The districts back in 1913 represented the population distribution of the U.S. at that time.

913年划分的区域代表着,当时美国人口的分布。

耶鲁公开课 - 金融市场课程节选