单词 | ball-and-socket joint |
释义 | ball-and-socket joint/ˌbɔːləndˈsɒkɪt ˌdʒɔɪnt /noun A natural or manufactured joint or coupling, such as the hip joint, in which a partially spherical end lies in a socket, allowing multidirectional movement and rotation.The hip joint is a ball-and-socket joint because the spherical head of the femur moves inside the cup-shaped acetabulum....
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