But measuring these changes in rainfall over the ocean is very, very difficult to do. But salinity is actually an important parameter that gives us an indication of what might be going on.
许多天气预报模型暗示，当气温升高的时候，水循环会发生变化，但是，我们很难在海洋上测量降雨的变化，不过，海洋中的盐分水平实际上是一个重要参数，能表明海洋上降雨的变化。
Rainfall amount is used to measure precipitation and also to evaluate the precipitation enhancement effect as an important parameter.
雨量是大气降水的量度，还是人工增雨效果评估的重要参量。
And it clarify the process of rectified model: replace terrain function to diffusion parameter, integrate rainfall function, drain function and seepage function to function item.
在此基础上叙述本文的城市洪水模型的改进过程：扩散系数用地面高程函数代替，综合降雨函数、渗透函数和排水函数形成函数项。
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