rotating loop

例句：

1. 1. The machine has a rotating loop that can be used to rotate the parts.
   这台机器有一个可以旋转部件的旋转环。
2. 2. The engineer designed a rotating loop to improve the efficiency of the machine.
   工程师设计了一个旋转环来提高机器的效率。
3. 3. The rotating loop was used to hold the parts together during the assembly process.
   旋转环被用来在装配过程中固定零件。