Air pollution is at its worst over big cities where millions of people live, work, and travel about in cars, buses, and trucks.

好几百万人在城市里工作、生活，还以轿车、公共汽车和卡车为交通工具，因而这种百万人口的城市空气污染最为严重。

youdao

The auto industry has shown how it can improve fuel efficiency, so we must work out a timely updating of such standards for cars, light trucks, and SUVs.

汽车生产业已经向我们展示了他们如何提高燃料效率，而我们要必须及时地对汽车，轻卡，越野车，制定一个新的这样的标准。

youdao

Even with all their work on big Volvo buses and large trucks under license, they don't seem to have mastered that part of it yet.

即使他们已经取得了大型沃尔沃客车和大型拖拉机的生产许可，他们看起来还是没有能够得其要领。

youdao

We expanded that to work trucks just a few months ago for the first time ever.

WHITEHOUSE: Press Briefing

The rules that were created working with the industry added certainty for cars and now we've added work trucks to that rule as well.

WHITEHOUSE: Press Briefing

On Tuesday, August 9th, the President will travel to Interstate Moving Services in Springfield, Virginia, to announce first-of-their-kind fuel-efficiency standards for work trucks, buses and other heavy-duty vehicles.

WHITEHOUSE: Press Briefing