Scientists have strived to find a solution by mixing it with expensive metals such as nickel.

科学家们一直在努力寻找一种解决方案，将其与镍等昂贵金属混合使用。

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The key component is made from the metal cerium, which is almost as abundant as copper, unlike other rare and expensive metals frequently used as catalysts, such as platinum.

其核心部件是由金属铈制成，这种金属与铜一样储量广泛，而不像其它通常被用作催化剂的金属那样稀有和昂贵，例如铂。

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He and other analysts said efforts to switch out of more expensive metals are pretty much ongoing in industry.

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Other expensive metals, such as vanadium and chromium, could also become cheaper.

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For that our driver would be getting a car made of expensive metals and complex composites that costs many thousands of dollars more than any comparable vehicle today.

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