maintenance work

例句：

1. 1. The maintenance work on the new buildingis well underway.
   新建筑的维护工作正在顺利进行。
2. 2. The company's mainpriority is to maintain its fleet of vehiclesin top condition.
   该公司的首要任务是保持其车队处于最佳状态。
3. 3. Theengineers are responsible forthe upkeep of the complex's infrastructure.
   工程师们负责维护综合体的基础设施。