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

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  1. they have all not only lost the pigment in their skin,
    它们不仅失去了皮肤色素
  2. but also their eyes.
    眼睛也退化了
  3. 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
  4. 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
  5. 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
  6. Receptors in their skin detect minute movements in the water made by its prey.
    皮肤上的探测器能觉察到 猎物引起的最微小的水流变化
  7. External gills help it to breathe in water that is particularly low in oxygen.
    外生的鳃帮助它们 在极度缺氧的水中呼吸

来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 260 行

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