compound swivel arm

例句：

1. 1. Theengineer designed a compound swivel arm to make the machine more efficient.
   工程师设计了一个复合万向臂，使机器更加高效。
2. 2. The new car has a compound swivel arm that allows for easy maneuvering.
   新款汽车有一个复合万向臂，可以轻松操控。
3. 3.The construction worker used a compound swivel arm to lift heavy objects without straining his back.
   建筑工人使用复合万向臂举起重物，而不会感到背部疲劳。