实际上，现代CISC处理器将自己的指令转换成了内部使用的risc格式，以实现更高的效率。
In fact, most modern CISC processors actually translate their instructions to an internalized RISC format for efficiency.
在使用改写查询作为问题的短期解决方案不可行的时候，比如查询的执行效率很低的时候，外部优化器指令可能很有用。
External optimizer directives are useful when it is not feasible to rewrite a query for a short-term solution to a problem, for example, when a query starts to perform poorly.
总的来说，Sitemaps 0.90协议对爬行效率提供了改进，而常规站点地图引用和组合的机器指令无法完成这点。
Overall Sitemaps 0.90 protocol offers an improvement in terms of crawling efficiency that cannot be accomplished using regular sitemap references and robot directives combined.
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