大检修

例句：

1. 1. The factory has been undergoing a major overhaul to improve efficiency.
   工厂正在进行大规模维修以提高效率。
2. 2. The car was in need of a major repair after the accident.
   事故发生后，这辆车需要一次大规模的维修。
3. 3. The old building needed a major overhaul to meet modern safety standards.
   这座老建筑需要进行大规模维修以符合现代安全标准。