- And the Belizean white crab is another creature that is unique to just one cave system.
而伯利兹白蟹是另一个 洞穴生态系统中的特有物种 - Living in perpetual darkness
由于一直生活在黑暗之中 - they have all not only lost the pigment in their skin,
它们不仅失去了皮肤色素 - but also their eyes.
眼睛也退化了 - It takes thousands of generations for eyes to be lost,
眼睛的退化需要经历数千代的演变 - so these species must have been isolated for a very long time.
所以这些物种必定 与世隔绝了相当长的一段时间 - But the blind salamander has other highly developed sensory organs.
不过这些瞎眼的蝾螈 进化出了其它发达的感觉器官
but also their eyes. 眼睛也退化了
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