query graph的用法和样例：
例句
- The right side of the diagram shows the elements that are included in the current query.
右边的关系图显示了当前查询中包含的元素。 - An approach to approximate querying of general graph structured semistructured data is proposed based on a relational database system.
提出一种利用关系数据库系统在一般图结构的半结构化数据上进行近似查询的途径。
