無(wú)效?annul; nullify; invalidate; override
?null and void;invalid;of (or to)no avail
宣布法令～annul a decree/使否決～override a veto/宣布合同～annul a contract/合同～nullity of contract/要求判定婚姻～的訴訟nullity suit/使核武器～和過(guò)時(shí)render nuclear weapons impotent and obsolete/宣布條約～declare a treaty invalid (or null and void);invalidate(or nullify)a treaty/宣布選舉～ nullify an election/醫(yī)治～ fail to respond to medical treatment/～票invalid ballot/～指控invalid charge/～合同invalid contract/～審判mistrial |