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1·The first organisms that reproduced sexually were free-floating plankton.

最早的有性繁殖生物是自由漂浮的浮游生物。《柯林斯英汉双解大词典》

2·This book has large color photographs of sea animals, from plankton to clownfish to orcas.

这本书有许多海洋动物的彩色照片，从浮游生物到小丑鱼乃至逆戟鲸。

3·This change in plankton found in marine deposits is what marks the boundary between the Cretaceous and the Tertiary.

海洋沉积物中浮游生物的这种变化标志着白垩纪和第三纪的分界线。

4·There may be giant plankton on gaseous planets. They float in a thick atmosphere like small spaceships and live by eating lightning.

气态星球上可能存在巨型浮游生物。它们像小型飞船那样漂在厚厚的大气中，靠“吃”闪电获取能量为生。

5·Plankton generally thrive in areas of the ocean with sufficient concentrations of certain nitrogen compounds near the surface, where plankton live.

浮游生物通常在海洋表面附近某些含氮化合物浓度足够高的区域大量繁殖，而海洋表面正是浮游生物生存的地方。

6·These areas have particularly low concentrations of iron, and oceanographers hypothesize that this shortage of iron prevents plankton from thriving.

这些地区的铁含量特别低，海洋学家推测，铁的缺乏阻碍了浮游生物的繁殖。

7·However, an experimental release of iron compounds into one such area failed to produce a thriving plankton population, even though local iron concentrations increased immediately.

然而，尽管当地铁浓度立即提高，在一个这样的区域实验释放铁化合物却没有产生大量的浮游生物。

8·The fish live on the plankton.

这种鱼以浮游生物为主食。《柯林斯英汉双解大词典》

9·Some areas, though rich in these nitrogen compounds, have few plankton.

有些地区虽然富含氮化合物，但浮游生物却很少。

10·Most marine deposits from around the world contain either plankton or a lot of fern spores but not both together in the same layer.

世界上大多数的海洋沉积物不是含有浮游生物就是含有大量的蕨类孢子，但它们并不是同时存在于同一层中。