major equipment

例句：

1. 1. The construction site requires a lot of major equipment to ensure safety.
   施工现场需要大量的主要设备来确保安全。
2. 2.The company has invested heavily in major equipment for its production line.
   该公司在生产线上大量投资于主要设备。
3. 3. The engineers are responsible for maintaining and upgrading the major equipment in the factory.
   工程师们负责维护和升级工厂的主要设备。