[wú xiào]
of no avail; to no avail; invalid; null and void; nullity (合同等的); in vain; unavailability; ineffectiveness; inefficiency; futility; flop
									
										nullify an election
										宣布选举无效
									
									
									
										fail to respond to medical treatment
										医治无效
									
									
									
										declare decision invalid
										宣布决定无效
									
									
									
										an invalid contract
										无效的契约
									
									
									
										make the investment inefficient
										无效投资