如果在全局配置文件中出现，则会改变所有站点的全局限制。
If it will appear in the global configuration file it will change the global limit for all sites.
如果此指令出现在站点配置文件中，则会改变这个站点的限制，但不会超越全局限制。
If this directive will appear in a per-virtual-site configuration file it will change a limit for this site only and this limit could not exceed the global limit.
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