debase: implies a loss of position, worth, value, or dignity: issued a ~d coinage.


vitiate: implies the impairment or destruction of purity, validity, or effectiveness by introduction of a fault or defect: partisanship and factionalism ~d our foreign policy.   (impair损害恶化: 使完整有效性降低to make less complete or efficient by deterioration，如years of smoking had impaired his health长年吸烟损害了他的健康) （defect本质缺陷,使无法运转, 如the smoke detector failed because of a mechanical defect由于机械缺陷烟雾探测器失效）


deprave: implies moral deterioration by evil thoughts or influences: hoping to banish ~d thoughts.   (evil邪恶好像有点重,这里译成不良)   (banish驱逐流放，如John was banished from England to Australia约翰被逐出英格兰流放到澳大利亚，例句表示努力排除)  又如this book is likely to deprave youngsters这本书可能会使青少年堕落


corrupt: implies loss of soundness, purity, or integrity through the action of debasing or destroying influences: believes that jargon ~s the language.   (integrity 1正直，2完整 ，如territorial integrity领土完整)


debauch: implies a demoralizing or debasing through sensual indulgence: led a ~ed life after the divorce.    （sensual表示感官有负面意涵，正常微风让人感觉舒服用sensuous）


pervert: implies a twisting or distorting from what is natural or normal so as to debase it completely: ~ed the original goals of the institute.


debase贬抑: 降低地位价格价值尊严等，vitiate损害: 由于带来缺点缺陷，损坏或毁坏纯洁有效性，deprave堕落: 受不良思想影响，导致道德退化，corrupt腐蚀腐败: 降低健康纯洁完整性等，debauch放荡放纵: 沉溺于感官，pervert扭曲变态: 扭拧变形变得完全不自然不正常


记忆方法: 1) 首字母DVDCDP排序成PDCDVD胖的丑玩的, 变胖变丑变爱玩<==堕落

         2) 堕落的意思是品质品格下降mean to cause deterioration or lowering in quality or character. (deteriorate下降恶化，如~ of situation情势恶化,又如~ of memory记忆力下降, 该词和impair互释,表示不如之前完整有效,一个强调动作一个强调结果)