it

2731 篇文章
As it builds up
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As it builds up 随着它的积累

builds up it as
It also builds.
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It also builds. 它们还能造景

builds also it
and when it meets the air in the cave
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and when it meets the air in the cave 当它与洞内空气接触时

meets cave air it when in the and
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

takes complete than more days it to one
and anything that falls into it.
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and anything that falls into it. 以及任何掉进里面的东西

anything falls into it that and
so big a jumbo jet could fly through it.
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so big a jumbo jet could fly through it. 大到可以通过一架大型喷气式客机

jet jumbo fly big through could it so a
making it mildly acidic.
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making it mildly acidic. 成为弱酸性

acidic mildly making it
it was actually formed under water.
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it was actually formed under water. 它实际上却是在水下形成的

under actually formed was it water
Most of the world's caves are found within it
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Most of the world's caves are found within it 世界上大部分洞穴内都存在石灰岩

caves found within world's most it of the are
and it covers nearly 10 percent of the earth's surface.
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and it covers nearly 10 percent of the earth's surface. 它覆盖了地球表面将近10%的面积

earth's surface percent covers nearly it of the and