annul the drug’s effect
使药失去疗效
invalidate a contract
使合同无效
annul improperly registered trademarks
撤销注册不当商标
to invalidate by crossing or blotting out
涂消作废
annul a concession agreement
中断租让合同
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