名词
中文翻译：僵硬关节
同义词：
['stiffness', 'stiffness', 'rigidity']
例句：
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1.She had a stiff joint in her back that made it hard for her to walk.
她的背部有一个僵硬的关节，让她很难走路。
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2.The doctor advised him to exercise regularly to improve his stiff joints.
医生建议他定期锻炼来改善他的僵硬关节。
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3.After years of sitting, his legs were stiff and he had to use crutches to get around.
经过多年的久坐，他的腿变得僵硬，他不得不使用拐杖来移动。