People would benefit greatly from a pollution-free vehicle.

人们将极大地受益于无污染汽车。

《柯林斯英汉双解大词典》

How are glowing plants made pollution-free?

发光植物是如何做到无污染的？

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To get citizens out of their cars and onto pollution-free bikes, they started the Yellow Bike Project.

为了让市民走出汽车，骑上无污染的自行车，他们启动了小黄车项目。

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And the dymaxion car -- which could have provided safe, pollution-free transportation using little gasoline -- was never produced.

VOA: special.2010.05.30

Caviar produced in the Sologne, a rural, pollution-free region of central France, has found fans among French chefs.

WSJ: Black Gold: French Caviar Is �� la Mode

In the long-term, it could have a glittering future for it leads the world in pollution-free hydrogen fuel-cell cars.

ECONOMIST: Detroit's finest are in dire straits

President BUSH: We will increase our research in better batteries for hybrid and electric cars and in pollution-free cars that run on hydrogen.

NPR: Slate's Politics: State of the Union Specifics