casing ring

例句：

1. 1. The engineer designed a new casing ring for the machine.
   工程师为机器设计了一个新的外壳环。
2. 2. The casing ring is made of high-quality stainless steel.
   外壳环是由高质量的不锈钢制成的。
3. 3. The casing ring protects the device from damage during transportation.
   外壳环在运输过程中保护设备免受损坏。