When the thigh of the lead leg drives up to a position parallel to the track, momentum is transferred to the lower leg, which extends naturally.
当起跨腿的大腿部分平行于跨栏时，动力转向自然伸展的小腿。
When the thigh of the lead leg drives up to a position parallel to the track, momentum is transferred to the lower leg, which extends naturally.
当起跨腿的大腿部分平行于跨栏时，动力转向自然伸展的小腿。
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