And when the time comes, their young will be washed back out to sea. 时机成熟时 虾虎鱼幼崽将被湍流冲回大海

181. This goby has been climbing for days.
     这只虾虎鱼已经爬了好几天了
182. Made it!
     成功了
183. Those that reach the top can now prepare to breed.
     抵达瀑布顶端的虾虎鱼现在可以准备繁殖了
184. And when the time comes, their young will be washed back out to sea.
     时机成熟时 虾虎鱼幼崽将被湍流冲回大海
185. The extraordinary power of flowing water
     流水的非凡力量
186. makes it our planet's greatest architect.
     使其成为地球上最伟大的建筑师
187. This may look like the surface of an alien planet...
     这里的地表看上去仿佛如同外星世界

来自《行星地球 第三季 第四集 Planet Earth S03E04 淡水》第 184 行