记忆方法
将“insanity”分解为“in”和“sanity”。想象一个人（sanity）变得完全“in”于某种状态，这种状态极度疯狂或不正常，从而形成“insanity”这个词的记忆。
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中文词源
insanity 精神失常
来自insane,精神失常。
英语词源
- insanity (n.)
- 1580s, "state of being insane," from Latin insanitatem (nominative insanitas) "unhealthfulness," noun of quality from insanus (see insane). Meaning "extreme folly" is from 1844.
权威例句
- 1. Phillips murdered his wife, but got off on a plea of insanity.
- 菲利普斯谋杀了他的妻子，但以精神错乱为由逃脱了惩罚。
- 2. The insanity which ran in his family haunted him.
- 家族遗传的精神错乱困扰着他。
- 3. It was a period of collective insanity, of legalized murder and mayhem.
- 那是个集体丧失理智、谋杀与暴力合法化的时期。
- 4. The defence pleaded insanity, but the defendant was found guilty and sentenced.
- 辩方以精神错乱为由进行申辩，但被告被判有罪并获刑。
- 5. He pleaded innocent by reason of insanity.
- 他以精神不健全为由申辩无罪。