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？

youdao

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。

youdao

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

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

The river was nearby, clear and free of all pollution, and petrol was easy to obtain, in unlimited quantities, from the filling stations and parked cars.

NEWYORKER: The Autobiography of J.G.B.