They're setting off on the longest overland migration 斑马的迁移距离称霸

143. In the Kalahari, brief rains have given way to the dry season.
     喀拉哈里沙漠短暂的雨季已被旱季替代
144. Food and water are becoming increasingly scarce.
     食物和水愈发稀缺
145. For these zebra, it's time to leave.
     这群斑马是时候离开了
146. They're setting off on the longest overland migration
     斑马的迁移距离称霸
147. made by any mammal in Africa,
     所有非洲哺乳动物
148. marching towards the scent of distant rains.
     嗅着远方雨水的味道不断前进
149. As drought intensifies,
     随着干旱加剧

来自《行星地球 第二季 第四集 Planet Earth S02E04 沙漠》第 146 行