512 篇文章
and since this discovery more than 120 miles of passageways have been mapped.
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and since this discovery more than 120 miles of passageways have been mapped. 自从那次发现之后 迄今已测绘了120多英里的地道

but cave explorers were soon to make an even more astonishing discovery.
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but cave explorers were soon to make an even more astonishing discovery. 但是洞穴探险家们 很快又有了更惊人的发现

There is, in fact, more life here than anyone would think possible,
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There is, in fact, more life here than anyone would think possible, 事实上 这里的生物数量 远比人们预料的更多

but the biggest surprise is something altogether more bizarre.
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but the biggest surprise is something altogether more bizarre. 不过更大的惊奇莫过于 那些更奇怪的东西

When the nearest exit may be hundreds of metres or more away,
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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

So far, more than 350 miles of underwater galleries in the Yucatan have been mapped,
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So far, more than 350 miles of underwater galleries in the Yucatan have been mapped, 人们迄今为止已绘制了350英里的 尤卡坦半岛地下水系图

as each year rainwater eats away a little more limestone.
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as each year rainwater eats away a little more limestone. 因为每年雨水都会侵蚀掉少许石灰岩

often more than 60 metres from the floor.
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often more than 60 metres from the floor. 通常高出地面60多米

It takes more than 30 days to complete one.
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It takes more than 30 days to complete one. 每个燕窝得花上30多天才能完工

and fly straight back for more.
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and fly straight back for more. 然后径直返回继续捕猎