This algorithm firstly searches for the matching keyword nodes of the query keywords, and then Bridges these keyword nodes through the central node of them to construct the subgraph.
该算法首先搜索得到与查询关键字匹配的关键字节点，再由这些关键字节点的中心节点将它们连接成子图。
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This algorithm firstly searches for the central node of the query keywords, and then searches for the keyword nodes through this central node to construct the subgraph.