一个是关于压力的流动方程，另一个是关于含盐浓度的对流方程。
One is fluid equation for the pressure, the other convection-dispersion equation for the saltwater concentration.
临界灌排比与灌溉引水量、排水量、河水含盐浓度、排水含盐浓度等因素有关。
Critical ratio of irrigation to drainage is related to the irrigation water volume, drainage water volume, salt content of irrigation water and drainage water and so on.
挤完以后还必须给奶牛准备一些含盐溶液，以保持牛奶的盐浓度。但奶牛也不能吸收过多盐分，否则牛奶中的盐分将会过高。
A saline solution needs to be prepared for the cows as their salinity has to be maintained, but they can't receive too much salt, or else the saltiness of their milk will be too high.
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