overhaul instruction

例句：

1. 1.The old building needed an overhaul to make it safe for use again.
   这座旧建筑需要彻底检查，以便再次安全使用。
2. 2.The engineers were called in to overhaul the engine.
   工程师被召来彻底检修这台引擎。
3. 3. After the earthquake, the city authorities decided to overhaul the infrastructure.
   地震后，市政府决定彻底检修基础设施。