grazers are marching in search of grass and water. 食草动物正浩浩荡荡地行进着 去寻找草和水

219. This is how grass can grow, given unlimited sunshine and water.
     这里让我们见识到了如果有足够的阳光和雨水 草能够长到什么程度
220. But on most tropical plains across our planet, the wet season is followed by a dry one.
     然而地球上的绝大多数热带草原 在经历雨季后总是要经历旱季的
221. 0n the African savannahs,
     在非洲的稀树大草原上
222. grazers are marching in search of grass and water.
     食草动物正浩浩荡荡地行进着 去寻找草和水
223. Without rain, these plains can become dust bowls.
     由于缺乏雨水 这里的草原变成了黄尘地带
224. Grass can now lose its hold.
     草现在也许会被连根拔起
225. Elephants are in immediate danger. They must drink almost daily.
     大象的生命变得岌岌可危 因为它们几乎每天都要喝水

来自《行星地球 第一季 第七集 Planet Earth S01E07 伟大草原》第 222 行