音标：['nʌlifai]
vt. 使无效, 废弃, 取消
【化】 使等于零; 作废
在线英汉词典
nullify的短语、例句：
nullify
v
(pt, pp -fied) [Tn]
1 make (an agreement, etc) lose its legal force 使（协议等）失去法律约束力.
2 make (sth) ineffective; counteract 使（某事物）无效; 抵销
How can we nullify the enemy´s propaganda? 怎样才能抵销敌人的宣传?
nullify