It's like we have laws of thermodynamics that underlie the use of engines, but you can't just go from the laws of thermodynamics to an automobile; there are a million steps along the way.

这就好比热力学定律,为引擎的使用打下了理论基础,但你不能从热力学定律一步跨越到发明汽车,这中间还要经历成千上万的步骤

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