So to drink, an ibex family must descend into the valley... 为了饮水 羱羊必须下到

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
23. The mothers pick out the safest way down.
    母羊选出一条最安全的下山路径
24. With soft cloven hooves that grip better than any climbing shoe,
    四只柔软的分趾蹄胜过最好用的登山鞋

来自《行星地球 第二季 第二集 Planet Earth S02E02 山脉》第 21 行