It can also affect large joints, such as the hips and knees and about a third of people with psoriatic arthritis also have a stiff painful lower back or neck.
它也能影响大关节如髋关节和膝关节，大约三分之一患这种病的人同样有腰部和颈部疼痛僵硬症状。
For stiff students, bend the knees a lot!
对于身体僵硬的学员，要更多的屈膝！
It was over, and she sat very stiff with her arms around her knees.
乐曲结束了。她抱着膝盖，僵硬地坐着。
It was over, and she sat very stiff with her arms around her knees.
乐曲结束了。她抱着膝盖，僵硬地坐着。
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