To find out, we asked Mark Mather, Associate Vice President of the Population Reference Bureau(PRB). 为了找到答案,记者采访了人口资料局副局长助理马克•马瑟。
The forecasts come from the Population Reference Bureau(PRB), a US body which supplies data to governments and institutions around the world. 这些预测由美国人口资料局做出。该机构向世界各地的政府和机构提供数据资料。
A recent study put out by the United States based Population Reference Bureau(PRB) indicates that fewer couples are choosing to get married. 最近根据人口资料局资料美国刊登出的一项研究表明选择结婚的情侣较少。
EarthSky spoke with Carl Haub, a demographer at the Population Reference Bureau(PRB), a Washington D.C. - based think-tank, about why the population is getting older. EarthSky就人口老龄化原因的话题采访了卡尔•霍伯。他是美国人口咨询局(PRB)的一名人口统计学家,也是华盛顿智囊团的成员。