boiler face

例句：

1. 1. The engineer inspected the boiler face before starting the engine.
   工程师在启动发动机前检查了锅炉正面。
2. 2. The new boiler face has been installedin the factory.
   新的锅炉正面已经在工厂安装好了。
3. 3. The engineer was concerned about thecondition of the boiler face.
   工程师对锅炉正面的状况感到担忧。