The US census bureau has led the way in sounding the alarm over the changes.

美国人口普查局率先对此人口老龄化趋势敲响了警钟。

US Census Bureau shows one in seven Americans on poverty line as Obama says reforms are vital

人口调查局的数据显示，每7个美国人中就有1个在贫困线上挣扎。 奥巴马说改革非常必要。