It is made from steel tubes, bicycle parts and a tractor tyre.

据悉，此车由现年 29岁的沃特收集来的钢管、自行车组件和拖拉机轮胎等拼装而成。

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Based on the cone index of a certain area, the optimized tyre parameters corresponding to a kind of tractor have been obtained by practical computation.

在此基础上，进一步讨论了具体某一种拖拉机轮胎配置的方法。

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I need a spare tyre for the tractor.

这辆拖拉机我还需要一个备胎。

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I need a spare tyre for the tractor.

这辆拖拉机我还需要一个备胎。

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