pikas never stray far from their burrows. 鼠兔从不敢远离自己的洞穴

183. but the most numerous grazer in Tibet lives underground.
     但数量最为可观的食草动物却深藏在地下
184. Pika, a relative of the rabbit. It, too, feeds on grass.
     鼠兔 兔子的亲戚,和兔子一样以草为食
185. 0n the exposed plateau,
     在毫无遮挡的草原上
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

来自《行星地球 第一季 第七集 Planet Earth S01E07 伟大草原》第 186 行