GMK only scans the database once, thus it can reduce the quantity of calculation rapidly and can be realized easily.
用GMK算法只需要扫描一次数据库，并且可以快速减小计算量，实现简单。
GMK only scans the database once, thus it can reduce the quantity of calculation rapidly and can be realized easily.
用GMK算法只需要扫描一次数据库，并且可以快速减小计算量，实现简单。
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