..freshwater has been making this journey. 淡水便无休止的循环往复

189. ..flowing towards the sea.
     一条条淡水河道
190. For 3.8 billion years,
     38亿年来
191. ever since the first rains fell...
     自从第一滴雨水洒落大地
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

来自《行星地球 第三季 第四集 Planet Earth S03E04 淡水》第 192 行