英语听力：自然百科 大迁徙 Great Migrations—1
时间：2014-05-21 07:36:33
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（单词翻译）
They're born to move, to move or die, forging ahead against terrifying odds1, navigating2 the first of millions of miles, spanning continents on fledgling wings, clattering3 ever onwards.
Right now, our planet is on the march, on the wing, on the run, and these are the tales of its creatures, born into the most moving stories on earth, the stories of the great
migrations4.
Life on earth is hard, perhaps nowhere harder than here and now. Every year, a timeless drama plays out on the Mara River. The elders have been through this many times. They must remember what awaits them. Their young know only the
pervasive5 smell of fear, the instinct to stay close.
But they must press on.
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