In this thesis, firstly the author tries to analyze the definition, the classification and formation of euphemism and clarify the relationship between euphemism and language.
本文首先从委婉语作为一种语言学概念入手，分析委婉语的定义、分类、构成以及委婉语与语言之间的关系。
This paper reviews the synthesis, classification, formation mechanism, morphology control and application of mesoporous materials.
综述了介孔材料的合成方法、分类、形成机理、形貌控制和应用。
Classification by the relation between formation and human activities, there are 36 man-made debris flows and 669 nature debris flows.
按泥石流形成与人类活动的关系分类，有人为泥石流36条，自然泥石流669条。
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