Among those, euphemism mainly concerns 1)death, ageing and sickness; 2) excretion and sex; 3) occupation and job; 4)poverty; 5)politics, military, etc. Rhyme contains alliteration, homoeoteleuton, assonance, consonance and onomatopoeia. (Luo Shiping,2005: 191-224)

2.2 Thesis Structure
2.2.1 Methodology
This paper only refers to the diet-related idioms not the whole idioms. Besides, the diet-related scope contains 1)food such as meat, fruits and vegetables, 2) drink such as juice and wine, 3)others, such as the eat and bite behaviour, seasoning and the tools of cooking and diet and so forth. 英汉语中与饮食相关习语的文化含义及形象意义对比(4):http://www.youerw.com/yingyu/lunwen_12700.html