(of a rule, system, etc. )规则、体系等 that cannot be used because it is not legally or officially acceptable 无效的;不能实行的 Your insurance policy will become inoperative if your circumstances change. 如果你的情况改变,你的保险单将无效。
(of a machine )机器 not working; not functioning correctly 不运转的;运行不正常的 opposite operative