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The floor of the Atlantic Ocean is split in two by an immense volcanic mountain chain that winds unbroken for forty five thousand miles around the globe.
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The floor of the Atlantic Ocean is split in two by an immense volcanic mountain chain that winds unbroken for forty five thousand miles around the globe. 大西洋被一条无边的火山山脉劈成两半, 绕地球绵延45000英里

In places, it's riven by great fissures, from which superheated water loaded with dissolved minerals
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In places, it's riven by great fissures, from which superheated water loaded with dissolved minerals 在这里 海底裂缝中含有大量溶解矿物质的滚烫海水

no need for the jet propulsion used by it's shallow water relatives above.
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no need for the jet propulsion used by it's shallow water relatives above. 不象它的浅海亲戚利用喷射水流的反作用力

It's huge bulk is sustained by mere microscopic creatures of the sea
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It's huge bulk is sustained by mere microscopic creatures of the sea 它的巨大身躯上是靠吃一种很小的海洋生物长成的

After an absence of seventeen years, the forest is now overrun by cicadas.
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After an absence of seventeen years, the forest is now overrun by cicadas. 在17年的缺席之后 森林中的蝉泛滥成灾

By June the days are at their longest
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By June the days are at their longest 6月是白昼最长的时候

By late spring the landscape is wrapped in a vibrant fresh green.
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By late spring the landscape is wrapped in a vibrant fresh green. 到了晚春,大地一片翠绿,风景如画

Growth is so difficult that conifers protect their precious leaves by filling them with resin.
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Growth is so difficult that conifers protect their precious leaves by filling them with resin. 因为生长困难 针叶树木用树脂来保护宝贵的叶子

Penguins may be featherweights by comparison
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Penguins may be featherweights by comparison 企鹅在海狗面前可能是轻量级选手

and that is patrolled by great whites.
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and that is patrolled by great whites. 大白鲨就在那里逡巡