对于这幅图，作者解释如下：
The phosphorus content slightly decreases or keeps an almost constant value with the increase in silicon content of the liquid alloy at each temperature.This means that the activity coef?cient of phosphorus becomes larger with the increase in silicon content because the decrease in aluminum activity raises that of phosphorus at AlP saturation.
不明白the activity coef?cient of phosphorus becomes larger with the increase in silicon content。为什么硅的含量增多会使P的活度系数变大？
还有问题就是the decrease in aluminum activity raises that of phosphorus at AlP saturation
为什么铝活度的增大使得磷在AlP中的溶解度增大？
前后有因果关系吗？
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