It adopts multiple query optimization algorithms.

系统采用了多重持续查询优化算法。

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This paper presents and evaluates a new type of query optimization algorithms that are based on layered backtrack algorithm.

该文提出了一类新的查询优化算法，并对其性能进行了评估、讨论。

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Experimental results show that this algorithm has higher precision of document retrieval and faster computation speed compared with conventional query optimization algorithms.

实验结果表明，该算法在查询精度和计算速度上均优于常用的查询优化技术。

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