The piriformis muscles, strong external rotators of the thigh, attach to the sacrum and the femur. Stretching them can increase S-I joint instability.
梨状肌是附着在骶骨和大腿骨上的强大的回旋肌，对他们的拉伸有损于骶髂关节的稳定性。
Conclusions Besides the injury of the radial collateral ligament, the injuries of the external musculus extensor and the aponeurosis can cause the posterolateral rotatory instability of the elbow.
结论肘关节后外侧旋转不稳定除桡侧副韧带的损伤外，可能还有外侧伸肌及伸肌腱膜的损伤。
In traditional wireless communication, due to the interference of the external environment and channel instability, the outage probability of network is high.
传统的无线通信中，由于外部环境的干扰，信道的不稳定，网络的中断率比较高。
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