对于数据库查询，这些控件产生自然语言输出，而不是接受自然语言输入。

These controls produce natural language as output, rather than attempting to accept natural language as input, for database queries.

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用户不需要掌握复杂的结构化查询语言，也无需了解数据模式，只需要输入查询关键词就可以进行数据库的查询。

Users do not have to master the complex query languages; nor do they have to be aware of the database schema. They only need to enter the keywords to perform a database query.

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