base: stresses the ignoble and may suggest cruelty, treachery, greed, or grossness: real estate developers with ~ motives.     （cruelty残忍指不同情甚至快乐, treachery背叛, greed贪婪, gross形容过错不合常理）


low: may connote crafty cunning, vulgarity, or immorality and regularly implies an outraging of one’s sense of decency or propriety: refused to listen to such ~ talk.   （crafty聪明机灵狡猾clever and subtle，如a crafty lawyer一个狡黠的律师， cunning和crafty解释相同，这里表示狡猾）   outrage顾名思义，就是超过人们能忍受的不生气的极限


vile: the strongest of these words, tends to suggest disgusting depravity or foulness: a ~ remark; the ~st of crimes.   （depravity道德败坏moral deterioration，如hoping to banish depraving thoughts希望摒弃道德败坏的想法）


base卑鄙低级: 语气相对轻，仅表示不高尚，如不同情不守信贪心不合情理等，low下流: 语气重，表示狡诈低俗不道德，违反礼节体面，vile邪恶: 语气最重，表示道德败坏肮脏让人恶心


记忆方法: 1) 首字母BLV想成Very Bad Lad很坏的小伙<==卑鄙      小伙子年轻人少年男孩伙计a lad is a young man or boy
   
              2) 卑鄙的意思是比一般人差令人鄙视mean deserving of contempt because beneath what is expected of the average person.首字母BLV想成Very Bad Lad很坏的小伙<==卑鄙