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Ligaments and tendons usually restrict the movement of the joint, but in some people, these normally restrictive tissues can be quite flexible and allow the extra movement we call "double-jointed."
韧带与肌腱通常会限制关节的活动,但是对于某些人来说,这些结缔组织非常灵活,能做出更大范围的运动,也就是我们所称的“双关节”。
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