Evaluate Math Expressions 评估的数学表达式
The XSLT language gives the processor great freedom to evaluate expressions in any order it chooses, because of the absence of side effects.
XSLT语言给了处理器很大的自由，让它可以按其选择的顺序对表达式求值，因为它没有副作用。
Once you've created your factory, you need to move from it to an object that can actually evaluate expressions and interact with the XPath environment.
创建工厂之后，还需要从工厂转移到能够真正计算表达式并与XPath环境交互的对象。
A breakpoint is a point in a function at which code execution stops and the programmer is given the opportunity to inspect the value of variables, evaluate expressions, call functions, and so on.
断点是函数执行停止所处的点，从而让程序员有机会查看变量的值、表达式的值、调用函数等等。
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