within the snow on these avalanche-prone slopes. 都在这些极易发生雪崩的山坡上冬眠

87. The mountains of North America
    北美洲的山脉
88. are hit by thousands of avalanches every year.
    每年要发生数千起雪崩
89. Yet one animal spends the whole winter slumbering
    然而有一种动物整个冬季
90. within the snow on these avalanche-prone slopes.
    都在这些极易发生雪崩的山坡上冬眠
91. And when spring comes, they emerge.
    待春天来临 它们就出洞了
92. All across these mountains,
    在这些山脉中
93. grizzly bears make their winter dens
    灰熊将巢筑在背风坡厚厚的积雪之下

来自《行星地球 第二季 第二集 Planet Earth S02E02 山脉》第 90 行