delusion 和 illusion 的区别是什么

illusion“幻觉，错觉”be under no illusion about sth.对某事不存幻想。
delusion“ 欺骗，迷惑”
与crucial的区别在于它对缺乏的或危急的程度有更 准确的衡量；还指"批判性的，分析性的"。

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: