这个例外就是xsl： sort指令，它的lang属性告诉处理程序应该按照和指定语言的文化传统一致的方式排序字符串。
The exception is the XSL: sort instruction, where the lang attribute tells the processor that it should sort strings in a manner consistent with the cultural conventions of the specified language.
当编译器不会改变程序的语义时，作为一种优化它可以随意地重新排序某些指令。
The compiler is free to reorder certain instructions as an optimization when it would not change the semantics of the program.
许多优化依赖于对关键编程指令重新排序来提高性能。
Many optimizations depend on reordering key programming instructions to improve performance.
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