nullify y使无效
nullify v使无效
nullify the election使选举无效
To nullify and void作废无效
to nullify the registration注销登记手续
have power to nullify有权撤销
nullify movie playback否定了电影播放;废止播放影片;电影播放无效
nullify an election宣布选举无效
to nullify an agreement把合约作废
V-T（及物动词） To nullify a legal decision or procedure means to declare that it is not legally valid. 使失去法律效力 [正式]
They knew the courts could nullify the marriage before the ink was dry.
他们知道法庭可以在签订婚约的墨汁未干之前，宣布婚姻无效。
V-T（及物动词） To nullify something means to make it have no effect. 使无效 [正式]
A missing or illegible name will nullify your vote.
遗漏或字迹难以辨认的名字会使你的投票无效。