So the increase of 12 years in maximum life expectancy during the 20th century was just one-third as large as the increase in average life expectancy during the period (36 years).

因此，20世纪最长寿命12年的增长幅度只不过是同期平均寿命增幅(36年)的三分之一。

youdao

So the increase of 12 years in maximum life expectancy during the 20th century was just one-third as large as the increase in average life expectancy during the period (36 years).

因此，20世纪最长寿命12年的增长幅度只不过是同期平均寿命增幅(36年)的三分之一。

youdao