Figure 1: Reduced costs, constant return.

图1：成本降低，利润不变。

youdao

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.

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。

youdao

Evaluate is called with the XPath string passed into the method, the DOM tree you built in the class's constructor, and the constant indicating to return results as a list of nodes.

使用传递给该方法的xpath字符串调用evaluate，在类的构造函数中构建的dom树和常量指示将结果作为一组节点返回。

youdao

So this line or these lines of code up here are arguably constant time steps to say if N is less than 2 in return, that it will always take maybe one step, maybe two steps, some number of fixed CPU cycles.

如果N小于2并返回,那么这些行所对应的代码,通常只需要执行一步，或者两步，具体数字与CPU周期有关。

哈佛公开课 - 计算机科学课程节选

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