nullify 基本解释
n. 虚假说，零假说
vt. 使抵消；使无效
nullify 词性变化
过去分词:nullified 现在分词:nullifying 过去式:nullified 第三人称单数:nullifies
中文词源
nullify 使废除，使无效
来自拉丁语nullus,无，没有，词源同no,-fy,使。引申词义使废除，使无效。
词组短语
1、nullify one's registration [法] 注销登记
2、nullify bandanna 废除大手帕
3、nullify the efforts 使努力无效
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