用户从有效的可替换的文法中选择，这种设计在本质上是一个自我建档的有限的查询工具。
The user chooses from a grammar of valid alternatives, so the design is in essence a self-documenting, bounded query facility.
用户从有效的可替换的文法中选择，这种设计在本质上是一个自我建档的有限的查询工具。
The user chooses from a grammar of valid alternatives, so the design is in essence a self-documenting, bounded query facility.
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