| 摘要 |
A treadmill includes a frame, a wheel disposed on the frame and two exercise sets arranged on opposite sides of the wheel. Each of the exercise sets includes a track installed on the frame, a rocker disposed on the frame, a crank connected to the wheel, a rod arranged between the crank and the rocker and a tread connected to the rod and crank on one hand and movable on the track at the other hand.
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