validitiesCOCA¹³²⁹¹¹ 基本例句 🌏效度；众数原型validity的复数 After maintenance, all safety devices must be recovered and checked for their Validities. Maintenance and repairing must be executed by qualified experts. 检修结束后，所有的安全设施必须放回原处，并检查其有效性。维护和维修必须由有资质的专业人员实施。 chinafanyi