evaluate() 方法拥有两个参数：一个字符串 XPath，一个 DOM 树（用来针对其计算该 XPath），还有一个 XPath 常量表示返回类型。

The evaluate() method takes two arguments: a string XPath, a DOM tree to evaluate that XPath against, and an XPath constant indicating the return type.

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对于每个虚方法，计算它的参数个数、名字和结果n，然后使用MOCK_METHODn进行定义，其参数就是方法的名字和类型。

For each virtual method, count how many arguments it has, name the result n, and define it using MOCK_METHODn, whose arguments are the name and type of the method.

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同时给出了其牵引绕组电压、电流等系统主要参数的计算。

The system interface parameters calculation, such as input voltage and cur-rent for traction windings is also presented.

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