To avoid starvation, 为了抵御饥饿

155. As drought intensifies, life gets tougher for all.
     随着干旱加剧 草原生活更加艰难
156. Predators with permanent territories must tough it out,
     定居于此的捕食者只能选择熬过去
157. while most of their prey disappear over the horizon.
     因为大部分猎物都已远去
158. To avoid starvation,
     为了抵御饥饿
159. many grassland animals follow a nomadic way of life.
     草原动物大多随水草迁徙
160. Over 2,000,000 wildebeests wander the East African savannahs
     超过两百万头牛羚奔走在东非大草原
161. chasing the rains.
     追逐着雨水

来自《行星地球 第二季 第五集 Planet Earth S02E05 草原》第 158 行