Trees are earth's largest organisms and are also one of the planet's oldest inhabitants.

树木是地球最大的制氧机器，也是这个星球上最古老的居民。

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It supports astoundingly complex and diverse communities of Marine life and is the largest structure on the planet built by living organisms.

那里有着种类及数量惊人的海洋生物，是世界上最大的由生物体组成的单体结构。

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It is the largest structure made up entirely of living organisms in the world, and no human has ever lived there.

这是世界上完全由生物机体组成的最大构筑物，但从来没有人类在那里居住。

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Corals are anthozoans, the largest class of organisms in the cnidaria group.

VOA: special.2010.08.10

The dispersant that has been used in the largest amounts on this spill, Corexit 9500, is among the most toxic to certain organisms of all those approved by the Environmental Protection Agency for use in oil spills, according to EPA tests.

WSJ: Gauging Harm to Ecosystem Could Take Years