"This could be the breakthrough we've been looking for on clean cars," said David Friedman, research director of the clean vehicle program at the Union of Concerned Scientists.

“这可能就是我们清洁汽车研究的突破了，”忧思科学家联盟清洁汽车项目研究主任戴维·弗里德曼说。

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Economist David Friedman says the Bay Area's job growth rate has slowed by two-thirds in the last year.

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David Friedman, a clean vehicles analyst with the Union of Concerned Scientists, demonstrates something called variable cylinder management.

NPR: States Push Automakers on Fuel Efficiency

David Friedman has, along with his wife, produced a book of medieval recipes.

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