看一张联合国的图吧。

 

 

Life Expectancy at Birth in China, Europe, USA and India: 1950-2050 (Both Sexes):

Source: World Population Prospects, the 2008 Revision. United Nations, Department of Economic and Social Affairs (DESA), Population Division, New York. See:www.unpopulation.org

请您先登陆,再发跟帖!