【delusion】delusion和illusion的区别是什么

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【答案】 问这2个词的区别,相信你看英语解释不成问题.下面是OALD和AHT的释义:
　　delusion
　　1[C] a false belief or opinion about yourself or your situation:
　　例:the delusions of the mentally ill * Don't go getting delusions of grandeur (= a belief that you are more important than you actually are).* He was suffering from paranoid delusions and hallucinations.* Love can be nothing but a delusion.
　　2[U] the act of believing or making yourself believe sth that is not true:
　　例:He seems to have retreated into a world of fear and delusion.
　　3[U]Psychiatry A false belief strongly held in spite of invalidating evidence,especially as a symptom of mental illness:
　　【精神病学】 妄想症：一种强烈的虚幻的信念,即使有使之无效的证据也毫不动摇,特指一种精神病症状：
　　delusions of persecution.
　　迫害幻想症
　　illusion
　　1[C,U] a false idea or belief,especially about sb or about a situation:
　　I have no illusions about her feelings for me (= I know the truth is that she does not love me).* She's under the illusion that (= believes wrongly that) she'll get the job.* He could no longer distinguish between illusion and reality.* I don't want to have my illusions shattered!
　　2[C] something that seems to exist but in fact does not,or seems to be sth that it is not:
　　Mirrors in a room often give an illusion of space.* The idea of absolute personal freedom is an illusion.
　　see also OPTICAL ILLUSION