At the national level it is easy enough, though expensive, to account for this by surveying CPOs and including them in the sample in proportion to their share of the population.

尽管昂贵，但从国家水平来看，民意调查如按CPOs在总人口中所占的比例计算，调查就会很容易。

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"The rest are primarily going to be smaller organisms, and a large proportion of them will be dwelling in places that are hard to reach or hard to sample, like the deep oceans," said Dr Tittensor.

“剩余的应该主要是更小型的生物，它们中有相当大的比例可能生活在我们几乎无法到达和取样的地方，例如深海。”Tittensor博士说。

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How to Sample a specific proportion of lines from a big file in r?

如何从R中的大文件的特定比例的线样？

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At the national level it is easy enough, though expensive, to account for this by surveying CPOs and including them in the sample in proportion to their share of the population.

ECONOMIST: Political polls

To do this, he and his team took a random sample from the corpus, checked what proportion were non-words and extrapolated that to the whole lot.

ECONOMIST: Science invades the humanities