youdao

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

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.

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