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。
The XSLT language gives the processor great freedom to evaluate expressions in any order it chooses, because of the absence of side effects.
同时还按顺序回顾了最有意思的代码片段，并论述了两种不同的表达式求值方法。
We reviewed the most interesting code snippets along the way and discussed two different approaches to expression evaluation.
通常，操作数的求值顺序不会影响表达式的结果。
Often, the order of operand evaluation has no impact on the result of the expression.
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