“使用期”用英语怎么说

北海的石油开采商激烈反对要求他们在石油钻井平台使用期结束之后将其移除的立法。North Sea operators kicked against legislation making them responsible for removing oil platforms at the end of their useful life.同时, 建筑的使用期分析已越来越成为预算考虑的因素之一.Increasingly, analysis o...