球状关节是的人类上肢骨骼可以在肩部自由旋转，这也是汽车车轮在转向柱的操控下转向的关键所在。

Ball and socket joints let your arm bones rotate at the shoulders and also allow the wheels of your car to be turned through the steering column.

youdao

球状关节是的人类上肢骨骼可以在肩部自由旋转，这也是汽车车轮在转向柱的操控下转向的关键所在。

Ball and socket joints let your arm bones rotate at the shoulders and also allow the wheels of your car to be turned through the steering column.

youdao