Creatures that live in the dark may lose their sight over evolutionary time.

凯伦·霍普金报道。 生活在黑暗环境下的生物可能在演化过程中视力逐渐下降。

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Creatures that live in the dark may lose their sight over evolutionary time. They may even lose their eyes entirely.

在黑暗中生活的动物可能会在进化过程中失去视力，甚至可能一点东西都看不见。

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These finds have fleshed out details about the emergence of their kind over evolutionary time, including the quintessential carnivore.

这些新发现补充了些关于恐龙是如何在进化史中出现的详细资料，其中当然包含了霸王龙这种典型的食肉动物。

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Traditional evolutionary theory suggests that one feature -- a tail for instance -- would slowly evolve over time.

CNN: Pterodactyl fossil fills gaps in evolutionary tale

The scientists stated that they had proved for the first time that changes in the body size and maturation of the fish is "an evolutionary response to over-fishing".

BBC: Fish on a trawler boat