Over the centuries, farmers have discovered thousands of different species of food crops.

几个世纪以来，农民们已经发现了数千种不同的粮食作物。

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The relative proportion of different species of animals hunted by people in the region also changed progressively.

该地区被人们猎杀的各种动物的相对比例也在逐步变化。

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Different species of these lived at the surface and the bottom of the ocean.

这种生物的不同种类生活在海洋的表面或底部。

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Several different species of coral can be present in the different colonies that form the reef structure.

VOA: special.2010.08.10

We don't have two different species of hydrogen here, so the electrons are perfectly shared.

我们没有两个不同源的氢原子，所以电子很好的而得到了平分。

麻省理工公开课 - 固态化学导论课程节选

They might have come from two completely different places, from two completely different species from different parts of the world, and they're put together in a new way and that's why it's called recombinant DNA.

它们也许来自两个完全不同的地方,来自世界上不同地区的两个完全不同的物种,以新的方式组合在一起,所以它被称作重组DNA

耶鲁公开课 - 生物医学工程探索课程节选

Most don't, but there are over 36 different species of mosquitoes in the Dallas-Forth Worth area.

NPR: Unusual Breed of Mosquitoes Hits Dallas

Mr Gingrich, a walking, talking, and sometimes dangerously undisciplined ideological fireworks display, was a different species of politician altogether.

ECONOMIST: Lexington

The centre is home to more than 30 different species of bird of prey, and primates, reptiles, invertebrates, raccoons and cats.

BBC: Animals at the Gentleshaw Wildlife Centre