求翻译：这是施工项目管理的最后阶段，也是执行合同条件的最后环节。在竣工交付后，按合同规定的责任期进行用后服务，回访维修，保证使用单位的正常使用：是什么意思？

This is the final stage of construction project management, is also the execution of the contract conditions of the last link. After the completion of delivery, according to the contract after the period of responsibility of the service, visit repair, guarantee and use of the normal use: