Their greatest threat is becoming trapped in the irrigation canals. 对它们最大的威胁是会被困在灌溉渠里

237. Following the dolphins in the murky water is extremely challenging.
     在浑浊的水中跟随印度河豚十分困难
238. They only surface for a split second
     它们跃出水面的瞬间稍纵即逝
239. and that makes protecting them difficult, too.
     这也使得保护它们变得困难
240. Their greatest threat is becoming trapped in the irrigation canals.
     对它们最大的威胁是会被困在灌溉渠里
241. But Uzma may have a solution,
     但乌兹玛也许有一种解决方案
242. and teams up with a rescue unit...
     她与救援队展开合作
243. ..to attempt something never done before.
     以尝试一些新东西

来自《行星地球 第三季 第四集 Planet Earth S03E04 淡水》第 240 行