There is a finite amount of freshwater on Earth... 地球上淡水资源有限

192. ..freshwater has been making this journey.
     淡水便无休止的循环往复
193. But today, two thirds of our world's great rivers
     然而今天 世界上三分之二的大江大河
194. no longer reach the sea.
     已不再入海
195. There is a finite amount of freshwater on Earth...
     地球上淡水资源有限
196. ..so humans have devised extraordinary means
     因此人类设计了非凡的方法
197. to ensure that it is always available to meet our every demand.
     来确保有足够淡水满足我们的需求
198. We now control freshwater...
     我们如今大规模地

来自《行星地球 第三季 第四集 Planet Earth S03E04 淡水》第 195 行