英语听力:自然百科 秋日黄石公园 Autumn—16
时间:2014-08-27 08:25:47
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(单词翻译)
The return of the wolf will always be controversial. But evidence is now emerging that wolves are far more important than anyone imagined, especially back in the heart of Yellowstone.
It's nearly the end of October. The cold autumn nights have brought a thin crust of ice to a
beaver1's pond. Unlike in the river valleys below, up here, there are not many tall cottonwood trees, so this beaver has built his dam from the shoots of young
willows2 sprouting3 all along the side of his pond.
But he is something of a novelty. Even by the time Yellowstone was made a national park,
beavers4 had been virtually hunted to
extinction5 by fur tappers. They only began to reappear here in 1995, the year the wolves came back.
Now wolves are chasing
elk6 again. Elk have had less time to eat willows, so willows are sprouting everywhere. Today, as winter approaches, all over Yellowstone, beavers are using those willows to put the finishing touches to a dam-building renaissance
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