Besides, the search steps in probabilistic CYK algorithm is reduced and the probabilistic CYK algorithm is improved by rearranging grammar rules of SCNF and establishing the index table.

此外通过重排scnf语法规则和建立索引表对概率CYK算法进行改进，减少中间搜索步骤所需的时间以提高效率。

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Stochastic Chomsky normal form (SCNF) is introduced to parse sentences with probabilistic CYK algorithm. The optimal parsing trees of sentences are gained to eliminate ambiguous meanings.

引入scnf语法，据此进行概率CYK剖析，得到句子的最佳剖析树以消除歧义。

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