a meeting of fresh and salt water. 淡水与咸水的交汇处

201. isn't.
     不对
202. It's just another kind of water.
     它只是另一种水
203. This is a halocline -
     这里是盐跃层
204. a meeting of fresh and salt water.
     淡水与咸水的交汇处
205. Fresh water from the jungle flows over the heavier salt water from the sea.
     咸水来自海洋 比重较重 来自丛林的淡水在其上方流动
206. The saltwater layer is extremely low in oxygen
     咸水层的含氧量很低
207. making it a particularly difficult place for animals to live.
     对动物而言是极为困难的生境

来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 204 行