When the nearest exit may be hundreds of metres or more away, 最近的出口可能远在 几百米之外或者更远的地方

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exit may metres hundreds or more be away of when nearest the
  1. but still nobody yet knows the true extend of this subterranean waterworld.
    但仍旧无人知晓 这个地下水世界究竟有多大
  2. And with good reason.
    以及它形成的原因
  3. Underwater caving is notoriously dangerous.
    地下水洞是出了名的危险
  4. When the nearest exit may be hundreds of metres or more away,
    最近的出口可能远在 几百米之外或者更远的地方
  5. running out of air down here would be fatal.
    在这里 耗尽氧气将是致命的
  6. To avoid getting lost
    为了避免迷路
  7. divers carry with them a spool of string.
    潜水员必须随身携带一捆轴线

来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 184 行

Walden21
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