The result of constant muscle tension and stiffness of joints, many of them are avoidable, and simple flexibility training can prevent these by making muscles stronger and keeping joints lubricated (润滑 ).
出自-2013年6月阅读原文
柯林斯高阶英汉双解学习词典释义
ADJ
联合的;共同的;共享的
Joint means shared by or belonging to two or more people.