结果表明，这种机械自动换向的方法是可行的。

The result shows that the automatical reversing method is feasible.

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交流电：周期性换向的电流，和直流电不一样。

Alternating current (AC) : Flow of electric charge that reverses periodically, unlike direct current.

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齿轮传动主要是通过齿轮的啮合作用来传递动力及实现减速、增速或换向的目的。

Gear power transmission is mainly through gear meshing to transmit power, realizing reducing and increasing speed or changing direction.

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