A more powerful tool is exclusive states, in which only rules matching the exclusive state can be matched (this is not supported in all versions of lex, but should be available in anything modern).
更强大的工具是排他(exclusive)声明，在这个工具中，只有符合排他声明的规则才能被匹配(并不是所有的lex版本都支持这项功能，不过所有最新版本中都应该可以获得该功能)。
The rule to describe the traces is defined, and the method to analyze and extract the computer operating traces based on the rules matching is proposed.
定义了痕迹描述规则，提出了基于规则匹配的计算机操作痕迹分析与提取方法。
Rules-matching and commands are only performed when the applications have been inactive, so any keyboard or mouse activity resets the application-inactivity timers.
规则匹配和命令仅在应用程序一直处于不活动状态时才执行，因此任何键盘或鼠标活动都将重置应用程序不活动计时器。
Rules-matching and commands are only performed when the applications have been inactive, so any keyboard or mouse activity resets the application-inactivity timers.
规则匹配和命令仅在应用程序一直处于不活动状态时才执行，因此任何键盘或鼠标活动都将重置应用程序不活动计时器。
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