降低电池的大小和重量的同时又能保证必需的电量一直以来都是电动汽车研发人员长期奋战的目标。

Reducing the size and weight of batteries with the necessary charge capacity has been a long-running battle for developers of electric cars.

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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？

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?

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