英语听力：自然百科 黄石公园的夏天 Yellowstone—18
时间：2014-08-27 08:03:57
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（单词翻译）
But just as the first of Yellowstone's new generation are preparing to leave, its last visitors are arriving. Night after night, army cutworm moths2 have been escaping the heat of a distant prairie. They have been flying in on favorable winds, hiding away in / rock crevices3 in the mountains. This is why the grizzly4 bears climb to the barren peaks. Two miles up, they / begin to search for the moths.
It is the end of summer, and the last snow of winter holds on only here. It offers a few
refreshing5 mouthfuls for travel-weary
cubs6.
Many of these bears learnt about this site from their mothers, as a part of local bear tradition. The family sets to work, finding moths, digging into the loose rock.
Though each
moth1 is very small, a bear that makes a successful strike can harvest up to 40,000 in a single day, that is 20,000 calories and vital weight gained for winter.
Having spent all summer avoiding males, the mother now finds one much too close for comfort. Perhaps she is seeking a mate, but he is unwelcome. Leaving her cubs, she confronts the male head-on.
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