英语听力：自然百科 黄石公园的夏天 Yellowstone—3
时间：2014-08-27 07:17:14
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（单词翻译）
This mother bear's experience gives her family a good chance of survival until spring arrives. They will return again and again as the thaw1 releases more fish.
On the warmer plains and valleys that surround the plateau, grazers are on the move. They left the high country to avoid the worst of the winter and now begin the long journey towards the heart of Yellowstone in time for summer. These
elk2 are led by experienced adults who have made this trip many times before.
They are followed on their
migration3 by the most ancient American grazers, pronghorn. Though
predators4 may follow, none can outpace them. Over distance, these are the fastest animals in the world, taking the long migration in their stride.
Migrating elk and pronghorn must follow the advancing thaw, but higher up in the valleys, one animal is well ahead of them. Bison are adapted for cold. These
herds5 need to be in Yellowstone early to have time to bring up their young in the short summer ahead.
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