desert-living elephants must also undertake long journeys 沙漠象也必须踏上旅途

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
150. desert-living elephants must also undertake long journeys
     沙漠象也必须踏上旅途
151. in search of water.
     寻找水源
152. The older females can remember where,
     年长的母象能记住哪些地方
153. even in times of extreme drought, there may still be water
     即使在极端干旱的季节也会有水

来自《行星地球 第二季 第四集 Planet Earth S02E04 沙漠》第 150 行