revoke: implies a calling back that annuls or abrogates what was previously done: had his license ~d for ninety days. (annul和nullify都表示官方正式废除，如to annul a treaty废除合约,to abrogate a privilege废除特权)
reverse: usually applies specifically to a high court's action in overthrowing a disputed law, decree, or court decision: the court of appeals ~d the opinion of the circuit court; when applied to actions or judgments of a non-judicial nature, it implies an upsetting of what was previously done: convinced the umpire to ~ his decision. 巡回法院 (decree法令: 个人颁布的命令: 如the Pope's decree that the next year will be the Holy year教皇颁布法令明年是"圣年"，有时候也可用于法院政府)
repeal: usually implies revocation of a law or ordinance by the legislative body that made it: ~ed the parking ban. (ordinance: 地方性针对特定行为的法律，权力有限)
rescind: implies the exercise of proper authority in abolishing or making void: ~ed their earlier decision in a second vote. (abolish指取消法律常规，如death abolition死刑废除) (rescind表示有权力取消废除，如Trump could rescind some congressional exemption 特朗普废除国会的一些豁免权)
recall: a less technical term, can replace any of the others: ~ a bid in bridge. 桥牌叫牌
revoke取消: 指官方正式的取消(call back)，reverse推翻: 指高等法院推翻(overthrow)有争议的法律法令决定，其它情况表示打乱(upset弄乱,如don't upset the sheets不要把床单弄乱)也就是取消，repeal撤销: 通常指立法机构取消自己制定的法律，rescind废除: 行使正当权力取消法律常规，recall收回: 专业性较弱，可替代其他各词(technical专业的，不要说成技术的，专业表示涉及专门知识，技术表示对专门知识的应用)。
记忆方法: 1）5个词都以词根re开头, re表示back往回<==取消
2）取消的意思是之前做过某事之后将其废除mean to undo something previously done.
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