1. A vertical gradient in ocean salinity. 
   （海洋的）盐度跃层海水盐度竖直梯度变化明显的水层
2. maximum gradient layer of sea water characteristics 
   跃层
3. maximum gradient layer of sea water density 
   密度跃层
4. maximum gradient layer of sea water salinity 
   盐度跃层
5. maximum gradient layer of sea water temperature 
   温度跃层

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