backing ring

• 衬环,托圈,垫环

backing ring的用法和样例：

例句

1. An investigation was made into one of the self-adjustable boltsconnecting the converter trunnion ring in a steel-mill which broke after being in service for 13 months.
   分析了炼钢转炉托圈连接螺栓早期断裂的原因。