报告表明数月来，三分之一，甚至是一半的汽车都不能使用，均在等待备用零件。

For months the reports show how a third - or even a half - of the team's vehicles were out of service, awaiting spare parts.

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科学家计划用这种材料来取代沃尔沃汽车存放备用轮胎的金属地板。

The scientists plan to use it to replace the metal floor of a Volvo car's boot which holds the spare wheel.

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这也会将电动汽车的电池在需要时成为备用电源。

That would also allow the batteries of electric cars to serve as a backup supply of power when needed.

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