could

421 篇文章
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
and that could be fatal.
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and that could be fatal. 而这将导致送命

fatal could be that and
In these conditions a diver could easily become disorientated
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In these conditions a diver could easily become disorientated 在这种情况下 潜水员很容易迷失方向

disorientated diver conditions become could these easily in a
the Yucatan's forest could not grow so luxuriantly.
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the Yucatan's forest could not grow so luxuriantly. 尤卡坦半岛的森林不可能长得如此茂盛

luxuriantly yucatan's could forest grow not the so
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
and that he therefore is the best father a female could have for her young.
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and that he therefore is the best father a female could have for her young. 以此来证明自己将是最好的父亲 雌江豚为了孩子就应该选它

father therefore best he could young female her for is that have the and a
Mugger crocodiles, four metres long, could easily take a single otter.
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Mugger crocodiles, four metres long, could easily take a single otter. 4米长的恒河鳄 能轻松捕获一只落单的水獭

crocodiles mugger otter metres could long easily four single take a
this bird could easily take a young markhor.
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this bird could easily take a young markhor. 这些大鸟能轻松抓起一只小羊羔

markhor bird could young easily take this a
but on these sheer cliffs any slip by either animal could be fatal.
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but on these sheer cliffs any slip by either animal could be fatal. 在如此峻峭的崖壁上 哪一方滑倒都有可能直接送命

fatal slip cliffs could either these be sheer animal any by but on
It's hard to imagine what could have attracted it here.
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It's hard to imagine what could have attracted it here. 真不知道这里有什么吸引着它

attracted hard what could here it it's imagine have to