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Caves are one of the few habitats on Earth not directly powered by sunlight.
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Caves are one of the few habitats on Earth not directly powered by sunlight. 洞穴是地球上少数几种 不直接依赖阳光的生态环境之一

Originally, this whole area would have been one solid block of limestone,
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Originally, this whole area would have been one solid block of limestone, 起初 这整个地方都是 一整块坚固的石灰岩床

One kind of rock makes this whole underground world possible -
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One kind of rock makes this whole underground world possible - 这些地底世界之所以会存在 都是因为一种岩石

and form one of the most productive habitats on the planet.
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and form one of the most productive habitats on the planet. 成为地球上一处 最肥沃的野生动物栖息地

The rose-eared spoonbill is just one of the 650 bird species found in the Pantanal.
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The rose-eared spoonbill is just one of the 650 bird species found in the Pantanal. 粉红琵鹭是潘塔纳尔沼泽地中的 650多种鸟类中的一种

is one of the widest waterfalls in the world -
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is one of the widest waterfalls in the world - 是世界上最宽的瀑布之一

one and a half miles across.
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one and a half miles across. 宽幅达1.5英里

where one massive tributary, the Rio Negro, flows into the main river.
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where one massive tributary, the Rio Negro, flows into the main river. 一条巨大的支流 ——内格罗河在此汇入干流

400 miles long and over a mile deep, Baikal contains one fifth of all the fresh water found in our planet's lakes and rivers.
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400 miles long and over a mile deep, Baikal contains one fifth of all the fresh water found in our planet's lakes and rivers. 贝加尔湖长400英里 深度超过1英里 其中淡水储量占到了全球江河湖泊淡水总量的1/5

all of which evolved from just one single ancestor isolated here thousands of years ago.
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all of which evolved from just one single ancestor isolated here thousands of years ago. 它们都是从一个数千年前 即被隔绝在此的祖先进化而来的