box flange

例句：

1. 1. The car's box flange is designed to protect the engine from damage during transportation.
   汽车的盒形凸缘设计用来在运输过程中保护发动机免受损害。
2. 2. The construction of the bridge required the installation of a box flange at each end.
   桥梁的建设要求在每个端部安装一个盒形凸缘。
3. 3. The box flange was used to secure the joint between two pieces of metal together.
   盒形凸缘被用来将两块金属连接在一起。