Occasionally , a sequence of fossil-rich layers of rock permits a comprehensive look at one type of organism over a long period of time.

偶尔，一个富含化石的岩层序列可以让我们持续并全面地观察一种生物。

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In other words, having only one type of fossil is often not enough to draw definitive conclusions about an ancient species' behavior.

换句话说，要对某种古代物种的行为得出明确的结论，只有一种类型的的化石是远远不够的。

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Now this is the simplest type of nuclear power plant and exactly replicates what is done in a fossil plant.

现在，这是核能电站最简单的类型，那也重复了在化石电站里会做的事情。

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One of the new specimens, known as KMN-ER 62000, has a face like the type specimen of Homo rudolfensis (the fossil that defines the species, if species it turns out to be), though it seems to be from an adolescent, whereas the type specimen is an adult.

ECONOMIST: Human ancestry has just got more complicated