they're worth tolerating because they provide a valuable early warning system. 它们还是值得忍受的 它们可以在危险来临之前给鼠兔预先的警告

186. pikas never stray far from their burrows.
     鼠兔从不敢远离自己的洞穴
187. But even so, squatters will move in given half a chance.
     可是尽管如此 鼠兔的洞穴还是经常被其它动物霸占
188. While ground peckers and snow finches can be a nuisance,
     然而尽管啄地鸟和雪雀鸠占雀巢的行为确实很讨厌
189. they're worth tolerating because they provide a valuable early warning system.
     它们还是值得忍受的 它们可以在危险来临之前给鼠兔预先的警告
190. The bizarre Tibetan fox. The pika's nemesis.
     长相怪异的藏狐 鼠兔的灾星
191. When stalking, it keeps below the skyline, perhaps helped by its curious body shape.
     在蹑手蹑脚地潜近猎物时,藏狐能保持特别低的姿势 可能其古怪的体型起了一定的作用
192. But why the square head?
     但是为什么是方形的头呢？

来自《行星地球 第一季 第七集 Planet Earth S01E07 伟大草原》第 189 行