科学美国人60秒 SSS 2013-09-09

（单词翻译）

 We already know that human population can get taller overtime,but a new study show just how extreme this growth ber can be.Academic storiology and ...the university as Alexandar Australian National University exame height changes in a relatively¹ short time period and small geographic² region.His data sample consists that the dovemails around 21 years old who were born in 19 European countries between 1856 and 1980.The study is published in Oxford³ Academic Papers.Over the century and a third,every child increased by about 11 centimetres,a good half a head.But why?According to Harton,improvements in sanitation⁴ and housing reduced inferior...and child diseases.The result in healthier and taller children.Other facts include increased wealth,education and social and health programe.Smaller family which insured that each child has more to eat may have played a role as well.In general,a taller population is a marker for better health.So congratulation for you,keep living large