A bottleneck funnels these exiting bats into dense concentrations 当大群蝙蝠密集地通过瓶颈出口时

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dense exiting funnels bottleneck bats concentrations these into a
  1. Night feeders leave the cave each evening.
    它们每天晚上出洞觅食
  2. And like all cave commuters
    和所有洞穴动物一样
  3. they are most vulnerable at the scheduled time of departure.
    它们在出发阶段最容易遭受攻击
  4. A bottleneck funnels these exiting bats into dense concentrations
    当大群蝙蝠密集地通过瓶颈出口时
  5. attracting the attention of others.
    很容易引起其它动物的注意
  6. The bats can detect the snakes using echolocation,
    蝙蝠能利用回声定位觉察到蛇
  7. but the snakes are literally in the dark -
    而蛇则完全处于黑暗之中

来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 228 行

Walden21
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