There is solid evidence that they lived in these caves, regardless of the cold.

有确凿的证据证明不管有多冷他们都住在这些洞穴里。

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Explorers even need to wear special masks to protect themselves from the gases in these caves.

探险家们甚至需要戴上特殊的面具来保护自己不受洞穴里气体的伤害。

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Sunlight reflecting off the water gives these caves their blue hue, making them popular for boating and diving.

海水反射的阳光使这些洞穴呈现出蓝色，使它们成为划船和潜水的好去处。

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Now these caves provide underground experiences for visitors.

VOA: special.2009.07.20

These minerals became the formations and shapes on the ceilings, walls and floors of the caves.

VOA: special.2009.12.07

So studying the organisms in these oxygen-free caves gives clues about the past.

VOA: special.2010.11.10

So what makes the bacteria in these caves so rich in antibiotic potential?

BBC: Cave bacteria could help develop future antibiotics

But if it was meant as a simile, it could also be taken literally -- because in a number of these caves, the local speciality, Cabrales cheese (a blue cheese similar to Roquefort) is quietly ageing in the gloom.

BBC: Spain��s mountains made of cheese

Colonel STEVE WILLIAMS (Deputy Commander, NATO): You've got these caves and these systems that these guys can in and cache weapons systems and then find other ways to come across the border, go to these cache sites and arm up.

NPR: NATO Beats Taliban in Battle, Works to Win War