Both single species and whole groups of species last for very unequal periods.

单独的物种以及整个的物种群存续的时期极不相等。

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Most importantly, we need to tackle species rich groups.

最重要，我们需要处理种类富有的组。

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Most importantly, we need to tackle species rich groups.

最重要，我们需要处理种类富有的组。

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