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The source of these toxic fumes lies several miles below.
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The source of these toxic fumes lies several miles below. 这些毒气的源头位于地下几英里处

Hydrogen sulphide gas bubbles up from oil deposits in the earth's crust.
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Hydrogen sulphide gas bubbles up from oil deposits in the earth's crust. 硫化氢气体从地壳内的油气储层中溢出

Bats survive by staying close to the skylights,
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Bats survive by staying close to the skylights, 蝙蝠之所以能生存是因为 它们始终呆在天窗附近

The water flowing out of the Villa Luz cave in Mexico
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The water flowing out of the Villa Luz cave in Mexico 从墨西哥露兹别墅山洞流出来的水

and troglodytes like the crab
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and troglodytes like the crab 像螃蟹这样的穴居动物

have to survive on whatever washes into the cave from outside.
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have to survive on whatever washes into the cave from outside. 必须得吃任何从外边冲进洞内的东西

The salamander might not encounter food for several months,
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The salamander might not encounter food for several months, 童态河溪螈可能 已有几个月没有吃东西了

The cave angel fish feed on bacteria in the fast flowing water
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The cave angel fish feed on bacteria in the fast flowing water 洞穴天使鱼以急流中的细菌为食

But the blind salamander has other highly developed sensory organs.
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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

Receptors in their skin detect minute movements in the water made by its prey.
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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