But to build a clean car is easier said than done.

但是生产清洁汽车说来容易做来难。

youdao

Tell him you'll pay him a bonus if you return to a clean car.

告诉他如果你回来时车是干净的，你会给他一份奖励。

youdao

The boy's parents clean car windscreens at traffic lights.

他爸妈在交通亮红绿灯的间隙给人擦挡风玻璃。

youdao

She said children would "look out the window of their family car and see that clean energy is part of their lives."

VOA: special.2009.06.19

If somebody comes here in a nice clean car and comes in to see me for half an hour and they go out and their car is covered they're not going to be happy.

BBC: Carlisle traders seek seagull problem solution

Mr. STEVE HINCHMAN (Conversation Law Foundation): And as consumers realize, they have a choice to buy a clean car that's 20 to 50 percent more efficient, we're going to hit a tipping point where it will no longer make economic sense for Detroit to continue making the dirty version of the car.

NPR: States Push Automakers on Fuel Efficiency

The attendant suggested I have them clean the car using a clay process, then apply a coat of wax by hand.

WSJ: Me & My Car: What's the Best Tire Pressure for a Saab?