任何由调用转换的开发人员所指定的参数值可以通过简单的方法调用而获得，并转化为更有意义的东西，如MDA API参考。
Any parameter values specified by the developer invoking the transformation are obtained with simple method calls and are typically translated into something more meaningful, like MDA API references.
数值通常由调用其他方法产生，很大可能来自于库包，这些方法返回一个数值给原来的表达式。
Values are often generated by calling other methods, possibly in library packages, that return data values to the original expression.
数值方法经历了由连续介质到离散粒子模型的进展过程。
Numerical Methods have experienced the development from continuum model to discrete particle model.
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