but there are more fundamental problems 但对于高山动物而言

47. But they'll soon need to
    但很快他们又得
48. return to the safety of the sheer cliffs.
    回到峭壁上的安全区域
49. Mastering precipitous terrain is always challenging,
    在峭壁上行走固然很难
50. but there are more fundamental problems
    但对于高山动物而言
51. for life in the mountains.
    还有更根本的难题
52. The Alps. Europe's highest peaks.
    阿尔卑斯山脉 欧洲最高的山峰
53. It's winter, and food is desperately short.
    时至冬季 食物极度匮乏

来自《行星地球 第二季 第二集 Planet Earth S02E02 山脉》第 50 行