boiler barrel of locomotive

例句：

1. 1. The engineer inspected the boiler barrel for any signs of wear and tear.
   工程师检查了锅炉筒是否有磨损的迹象。
2. 2. The new boiler barrel has been installed in the factory's main boiler room.
   新安装的锅炉筒已经安装在工厂的主要锅炉室。
3. 3. The old boiler barrel was replaced with a more efficient model to save energy.
   旧的锅炉筒被更高效的型号所取代，以节省能源。