boiler bottom

例句：

1. 1. Theengineer inspected the boiler bottom for anysigns of damage.
   工程师检查了锅炉底部，以寻找任何损坏的迹象。
2. 2. The oldboiler had a rusty bottom that neededto be replaced.
   旧锅炉底部生锈严重，需要更换。
3. 3. The fireman carefully removedthe boiler bottom to prevent further damage.
   消防员小心地移除了锅炉底部，以防止进一步的损害。