英语听力：自然百科 大迁徙 Great Migrations—12
时间：2014-05-21 07:53:49
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（单词翻译）
It takes four days for the larva to emerge. It gorges1 on its own egg case, before turning to tender milkweed. It must grow fat, build up its reserves for the long migration2 ahead. After two weeks of manic feasting, its body mass now 2,000 times what it was at birth. The caterpillar3 is ready. Anchored by silk, it begins its miracle.
Over the next two weeks, the caterpillar
literally4 dissolves into a bag of rich fluid. Its cells
sprout5 anew, giving rise to wings, legs,
antennae6... and then...
After a
scant7 few hours, it's ready to fly. This is a creature truly born to move, born to
outstrip8 its parents and grandparents' heroic efforts, carrying aloft the
genetic9 hopes of the species. Incredibly, more than a billion super
monarchs10 are now taking off. And for the first time in four generations, they're heading south, heading for their winter home.
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