The article makes a cognitive analysis on English structural ambiguity in terms of archetype-category theory and figure-ground theory so as to provide a new perspective for structural ambiguity study.

结构歧义的产生有很多原因，以原型范畴理论和图形背景理论为基点对英语结构歧义的成因进行认知分析不失为结构歧义研究的另一新视角。

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The structural dynamic SA in project is of great importance for the study on dynamic design, optimization design, control theory and dynamic modification etc.

工程结构的动态特性灵敏度分析对工程结构的动态设计、优化设计、控制理论和动态修改等方面的研究有着十分重要的意义。

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Abstract Hybrid orbital theory is an important content of inorganic chemistry and structural chemistry in college text book, and it is the basis for further study of element compounds.

摘要杂化轨道理论是大学无机化学、结构化学课程的重要内容，是后续元素化合物学习的基础。

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