maintenance rig

例句：

1. 1. The engineersare responsible for the daily maintenance of themachinery.
   工程师们负责日常的机器维护工作。
2. 2.The maintenance rig is essential for ensuringthe safe operation of the machine.
   维护设备对于确保机器安全运行至关重要。
3. 3. The companyhas invested heavily in maintaining its fleet ofmaintenance rigs.
   该公司在维护其车队方面投入了大量资金。