delusion: implies self-deception or deception by others concerning facts or situations and typically suggests a disordered state of mind: suffered from a ~ that his family hated him.


illusion: implies ascribing truth or reality to something that seems to be true or real but in fact is not: clung to the ~ of happiness.     （”real”和”true”都表示真的真实的，但有觉明显区别，real表示事物本身真实: 真正或实际，如real diamond, real friend, real love；但true表示语言文字反应等”和real真实的事物相符”，如true story, true feeling,true love, logically true, true hero, true intention。real/true love都表示真爱都很常用，你能说出它们的差别么）  false是true的直接反义词，前边例子里的true都可以替换成false   ascribe认为，把归因于，在2017-05-30 归因ascribe-charge组


hallucination: implies the perception of visual or other sensory impressions that have no reality but are the product of disordered function: suffered from terrifying ~s.


mirage: is comparable with the foregoing words in an extended sense in which it applies to vision, dream, hope, or aim that is illusory: the dream of peace was but a ~.


delusion欺骗错觉: 指关于实际情况的自我欺骗或他人欺骗，常表示思维错乱，illusion幻觉假象: 指认为真实实际，但其实不是，hallucination幻觉: 指功能错乱，看到或感觉到不存在的事物，如因患病吸毒，mirage幻觉假象海市蜃楼: 同上指虚幻的景象梦想希望目标    


记忆方法: 1）首字母DIHM想成Deceive HIM欺骗他<==虚幻     "虚"是会意字，从虍( hū)从丘，字面意思是虎豹横行，了无人烟的地方。"虚"本义是"大山丘"，<说文>: "虚，大丘也"。大则空旷。故引伸为"空虚": <尔雅>:"虚，空也"。再引申出虚假虚弱虚空虚心虚耗虚惊等      "幻"的意思是"不真不定而迷"，即有两个意思  1、不真实的，虚无的梦幻的短暂的，如幻想幻影幻境幻灭亦真亦幻虚幻梦幻   2、变化的，如变幻莫测幻化。 ”幻”字是”予”字的反字，好像影子       虚幻合用表示虚假虚无，如红楼梦中太虚幻境，有"假作真时真亦假，无为有处有还无"---真假有无是可以互相转换

         2）虚幻的意思是虚假事物mean something believed to be or accepted as true or real that is actually false or unreal.