annul the drug’s effect
使药失去疗效
quash a court judgment
撤销法庭判决
annul a concession agreement
中断租让合同
to quash an indictment
撤销起诉
annul a visa already issued
宣布签证作废
annul the tendering process
取消招标
annul a letter of credit
取消信用证
quash militia violence
镇压民兵暴力事件
annul all outdated rules
废除一切陈规
annul a subcontract
废除分包合同