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Literature review1. Previous studies on euphemism Through decades, people have ceaselessly enriched the study of euphemism. So far, the most outstanding of various papers is published by Hugh Rawson in 1981. A Dictionary of Euphemisms and Other Doubletalk embodies the research findings made by Britain and American linguists for all these years. Rawson didnt only reviews the overall research history of euphemism but also profoundly discussed about the features, definitions, categories, scope of the study and so on. That makes the book a classical work. Neaman and Silver made a comprehensive study of euphemism in theirKind Words, a treasures of euphemisms (1983) which have great reference values. Another important synthesis of previous study, Fair of Speech, the Uses of Euphemism, was published in 1985. It is a collection of papers on euphemism and almost covers and contains every aspect of euphemism.2. Problems in the previous studiesAlthough the study of euphemism has made some achievements, at present, many researchers and scholars are just repeating the same work again and again unconsciously. Therefore, it lacks variety and profundity.