自行车的踏板与曲柄相连。

The pedals of a cycle are attached to a crank.

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自行车的踏板与曲柄相连。

The pedal of a cycle is attached to a crank.

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单独使用滚轮时，可在并列或者前后串列的两个滚轮的转轴装上曲柄，曲柄顶端有踏板轴。

When using the idler wheel only, fix the brace on the axes of the two idler wheels in paratactic or in series and the top of brace has footplate axes.

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单独使用滚轮时，可在并列或者前后串列的两个滚轮的转轴装上曲柄，曲柄顶端有踏板轴。

When using the idler wheel only, fix the brace on the axes of the two idler wheels in paratactic or in series and the top of brace has footplate axes.

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