英语听力：自然百科 大迁徙 Great Migrations—16
时间：2014-05-21 08:04:47
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（单词翻译）
Finally, they can rest. For another five months, they will cling to this winter refuge, entering a sort of "waking" trance of energy conservation. Until the longer days of spring awaken1 them again to mate and pass along to the young--their migratory2 imperative3, to fill the skies with a sun-spangled yearning4 to move, to start the whole glorious impossible journey once again.
On the other side of the world, another spectacular generation of
nomads5 is about to hatch. Over the next three weeks, the red
crab6 eggs will drift in the
perilous7 nursery of the Indian Ocean and morph into
larvae8. Most years, the larvae never make it home, swept away by ocean currents or
devoured9 by fish. But once or twice every decade, a
confluence10 of mild weather and scarce
predators11 gives birth to a moving miracle.
By the millions, they pour over the beaches of their birth like a living pink tide. They shed their larval casing becoming air breathers and
retrace12 their parents'
tortuous13 course guided only by instincts encoded deep in their
DNA14. From this moment on, they are migrants, compelled to move, no matter what.
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