a mill that is powered by men or animals walking on a circular belt or climbing steps 同义词：treadmill, tread-wheel,
A treadwheel or treadmill is a form of engine typically powered by humans. It may resemble a water wheel in appearance, and can be worked either by a human treading paddles set into its circumference (treadmill), or by a human or animal standing inside it (treadwheel).
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