boiler shell ring

例句：

1. 1.The engineer found the boiler shell ring in the workshop.
   工程师在车间里发现了锅炉壳环。
2. 2. The new design of the boiler shell ring has greatly improved its efficiency.
   新型锅炉壳环的设计大大提高了其效率。
3. 3. The engineer carefully inspected the boiler shell ring before installing it.
   工程师在安装前仔细检查了锅炉壳环。