你用过的所有程序，无论多么复杂，都是由一些这样的指令组合而成的。
Every program you've ever used, no matter how complicated, is made up of instructions that look pretty much like these.
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.
在例2中，一个业务策略指令是一个表达式，它是以下方面的组合。
In example 2, a business policy directive is an expression that is a mixture between.
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