全部

1·They keep the harmful air out.

它们把有害的空气挡在外面。

2·Ozone is one of the most harmful air pollutants.

臭氧是最具危害性的空气污染。

3·Full combustion, Then can make the output and harmful air attain the least and make use of the fuel with maximum limit.

在燃烧过程中必须实现油的充分燃烧，才能使产生的有害气体达到最小，最大限度地利用燃料。

4·The harmful air pollution of boiler smoke is introduced and the measure to burn coal fully and reduce the pollution is adopted.

介绍了锅炉烟气对大气污染的危害及采取锅炉节煤措施，使燃料充分燃烧、缓解污染的方法。

5·It said that tests showed that separate smoking rooms failed to stop potentially harmful air particles wafting into non-smoking areas.

德国癌症研究中心说，测试显示，单独的吸烟间不能阻止潜在的有害空气粒子飘进非吸烟区。

6·If there is something harmful in the air, the eyes fill with tears.

如果空气中有有害的东西，眼睛就会充满泪水。

7·If there is something harmful in the air, tears protect your eyes by covering them.

如果空气中有一些有害的东西，眼泪会通过遮住眼睛来保护眼睛。

8·Dirty air and water are harmful.

肮脏的空气和水是有害的。

9·In today's world, almost everyone knows that air pollution and water pollution are harmful to people's health.

在当今世界，几乎每个人都知道空气污染和水污染对人们的健康有害。

10·This can be really dangerous because there are harmful chemicals in the smoke from both wood and coal and they can seriously pollute the air in your home.

这是非常危险的，因为木材和煤炭产生的烟雾中都含有有害的化学物质，会严重污染家里的空气。