规则引擎可通过一组规则作为程序本身的一部分实现，也可以作为文件存储到数据库中。
A rule engine can be implemented using a set of rules as part of the program itself, or can be stored as files using a database.
无法通过一组规则实现这个目的，因为无法在希望按照特殊方式排序的字符中包含空格。
You can't do this with a set of rules because you can't include a space as part of the characters you want to sort in a special way.
自适应表示可通过一组规则和一个规则解释器实现，规则解释器负责根据用户概要文件确定针对特定内容所应使用的适当规则。
Adaptive presentation can be implemented using a set of rules and a rule interpreter that identifies the appropriate rule to be used for particular content, based on the user profile.
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