This paper, from the syntactic level, analyses some English ambiguous sentences, in which ambiguities are caused by the prepositional phrases.

本文从句法结构这个层面分析了一些由介词短语引起的英语歧义句。

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This article mainly expounds with examples the reasons causing lexical and syntactic ambiguities, and on this basis, puts forward some methods of eliminating ambiguous sentences in English.

英语歧义是语言本身一种内在的现象，产生歧义的原因很多，在语言的实际运用中表现为语音歧义、词汇歧义和句法歧义。

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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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