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    ball-and-socket joint

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    ball-and-socket jointBrE /ˌbɔːl ən ˈsɒkɪt dʒɔɪnt/ 🔊NAmE /ˌbɔːl ən ˈsɑːkɪt dʒɔɪnt/ 🔊 noun (anatomy 解剖学)
    a joint such as the hip joint at the top of the leg, in which a ball-shaped part moves inside a curved hollow part 球窝关节；杵臼关节