ObjectiveTo study the risk factors of gallbladder stone recurrence after percutaneous cholecystolithotomy(PCCL).

目的探讨经皮胆囊碎石术（PCCL）后结石复发危险因素。

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An incremental construction algorithm named PCCL of the constrained concept lattice was presented by using pruning technology that eliminated the redundant information in the construction process.

采用剪枝技术来消除构造过程中存在的冗余内涵比较，给出约束概念格渐进式构造算法PCCL。

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