If one of your research staff announced that he had worked out a way to propel a vehicle on a cushion of air, would you tell him to concentrate on something practical, or suggest taking it further?

如果你的一个研发人员宣布他已经相处一个办法来推动汽车在气垫上的空气。你会告诉他集中精力于某件事的实践上，或者建议更进一步么？

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