手把輸入旋轉運動於轉輪，主軸轉動其他圓筒齒輪。當主軸被固定不動時，圓筒齒輪繞著一個主軸做旋轉。

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The wheel is rotated by the input from the handle, and then main axis drives the other 圓筒齒輪 . When main axis is fixed, 圓筒齒輪 is rotated around main axis