To stabilize its population—discounting immigration—women must have an average of two children.

为了稳定人口——减轻移民的影响——妇女必须平均生育两个孩子。

youdao

That translates to an annual drop of about 1 percent of the average plankton population between 1899 and 2008.

这意味着自1899年至2008年之间，浮游植物的数量平均每年减少约百分之一。

youdao

India, with an average age of 26, is a younger country than China (33), and has started to look on its growing population as a potential asset.

人口平均年龄26岁的印度人比起中国(人口平均年龄33岁)来说是个更加年轻的国家，有鉴于此，印度将其不断增长的人口视为其潜在的财富。

youdao

Is that right, Jared, in an average year for our population?

WHITEHOUSE: Online Town Hall

If people in this population meet and breed at random, it turns out that you only need to go back an average of 20 generations before you find an individual who is a common ancestor of everyone in the population.

BBC: Family trees: Tracing the world's ancestor

But Yeovil, an area of similar population size with a faster average broadband speed, clocks up a monthly average of 4, 259 downloads.

BBC: A glimpse at piracy in the UK and beyond