He took a short leave of absence because of hip and knee problems.
他因为髋关节和膝关节出问题也请了短假。
What if you don't have knee problems, and you are hiking on level ground?
如果您没有膝盖的问题,您是徒步旅行的水平呢?
How to through the correct use of the hip and pelvis to improve knee problems.
如何透过正确运用髋关节和骨盆来改善膝盖问题。
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