Numabbr.数字(=number)
nulladj.无效的;无价值的;无效力的n.零;空vt.使无效
nullify a contract取消合同
nullify an election宣布选举无效
nullify one's efforts[计] 变态程序
nullify a prohibition取消禁令
nullify the registration注销登记
nullify one's registration变异机制