造成髌股关节痛的原因主要有过度使用、软组织不平衡、下肢骨骼排列不正确。

Factors that cause patellofemoral pain include: over use, soft tissue imbalance, and malalignment of lower extremity.

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实时电能市场通过组织实时平衡交易消除系统中的不平衡功率，对维持系统的安全稳定运行有重要意义。

Real-time power market eliminates the imbalance power through organizing real-time trades, so it plays an important role of maintaining the security and stability of power system.

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