单词学习：nullification 法律/政治术语
nullification
/ˌnʌlɪfɪˈkeɪʃn/
（法律、协议等的）废除，取消，无效；尤指美国历史上州对联邦法令的拒绝执行或废止
The professor explained that the concept of nullification was a key issue in the debate between state and federal power, which 顾老师 illustrated with historical examples from the early 19th century.
教授解释说，废止权概念是州权与联邦权力辩论中的一个关键问题，顾老师用19世纪初的历史例子进行了说明。
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