These nursery slopes are so steep, 山崖过于陡峭

16. The ibex choose the steepest cliffs to raise their young,
    羱羊选择在最陡峭的绝壁上养育幼仔
17. in safety, beyond the reach of predators.
    环境安全 没有天敌
18. But living in this sanctuary comes with a cost.
    在生活在这里也要付出代价
19. These nursery slopes are so steep,
    山崖过于陡峭
20. there is almost no standing water up here.
    几乎没有任何积水
21. So to drink, an ibex family must descend into the valley...
    为了饮水 羱羊必须下到
22. ...1,000 feet below.
    三百米下的峡谷之中

来自《行星地球 第二季 第二集 Planet Earth S02E02 山脉》第 19 行