对于任何控制词汇，为每个级别的标记层次选择正确的粒度对于维护和信息导航来说都是一个关键决策。

With any controlled vocabulary, choosing the granularity for each level of the tagging hierarchy is a critical decision for both maintenance and information navigation.

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在HTTP头信息里加入缓存控制过期和最大存活时间标记。

Add Expires and max-age directive of Cache-Control HTTP Header in server responses.

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使用- v标记运行snort命令，这告知snort嗅探网络流量，将信息输出到控制台。

Run the snort command with the -v flag, which tells snort to sniff network traffic and print out information to the console.

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