He forms a machine in his thought, and before his mental vision that machine appears with the wheels revolving this way and that, as necessary to accomplish the required work.

他在思想中形成了一个机器，这个机器有轮胎，并且以这样和那样的方式运转，在他的这个精神的想象力之前需要去完成必要的工作。

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He grabbed an iron crowbar that was lying on the ballast and, with precise aim, thrust it between the spokes of one of the rapidly revolving front wheels.

NEWYORKER: Among Animals and Plants