they

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they are most vulnerable at the scheduled time of departure.
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they are most vulnerable at the scheduled time of departure. 它们在出发阶段最容易遭受攻击

departure scheduled vulnerable most at time they of the are
they have become important shelters for many species.
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they have become important shelters for many species. 它们也成了许多动物的重要庇护所

shelters important become species many they for have
which they use as a refuge from predators.
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which they use as a refuge from predators. 这里是它们躲避天敌的地方

use refuge predators which from they as a
but they could never have known that these flooded passageways were actually the beginning of subterranean rivers,
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but they could never have known that these flooded passageways were actually the beginning of subterranean rivers, 但他们从不知道这些水下通道 其实是地下河的入口

subterranean passageways actually flooded rivers could these known beginning they of that never have the but were
500 years ago they supported one of the world's great civilisations
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500 years ago they supported one of the world's great civilisations 500年前 它们维系着 一个世界上最伟大的文明

civilisations supported world's great they of the one ago years
Like bats they use echolocation to navigate.
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Like bats they use echolocation to navigate. 和蝙蝠一样 它们也利用回声定位来导航

echolocation bats navigate use like they to
but they must still survive the attacks of other, more specialised, birds of prey.
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but they must still survive the attacks of other, more specialised, birds of prey. 但它们仍须躲过 其它更专业的猛禽的攻击

specialised attacks prey birds survive more must they of other the still but
As they leave the cave
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As they leave the cave 蝙蝠离开山洞后

cave leave they as the
they have a sinister purpose.
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they have a sinister purpose. 它们却是阴险的陷阱

sinister purpose they have a
They can stay down for more than 30 seconds
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They can stay down for more than 30 seconds 它们能在水下呆30多秒

seconds than more can down they for stay