| 1. | We introduce new vehicle emission standards to help clean the air
引进新的车辆废气排放标准，洁净空气 |
| 2. | Amendments of the clean air act
洁净空气修正案 |
| 3. | My mom likes keeping many houseplants . she says they help clean the air
我妈妈喜欢摆放很多室内盆栽。她说它们有助于洁净空气。 |
| 4. | Clean air package
罐装洁净空气 |
| 5. | Hot - air furnace is the heat - source equipment for supplying clean - air to dry grain
摘要热风炉是为粮食烘干提供洁净空气的热源设备。 |
| 6. | Clean air act amendment ( 1987 ) established a national air - quality standard for ozone
1987年洁净空气法修正案建立了空气的国家空气质量标准。 |
| 7. | Clean air amendment ( 1970 ) provided stringent automotive , aircraft , and factory emission standards
1970年洁净空气法修正案规定汽车、飞机与工厂排放标准。 |
| 8. | Only 1 percent of the country ' s 560 million city dwellers breathe air considered safe by the european union
欧盟认为这个国家五亿六千万城市居民中能呼吸到洁净空气的仅占1 % 。 |
| 9. | The environment also supplies direct benefits to households in the form of parks and recreation as well as , again , air and water
环境也向家庭提供直接的利益，如公园，休闲胜地，同样也有洁净空气和水。 |
| 10. | Clean air amendments ( 1990 ) required that motor vehicles be equipped with onboard systems to control about 90 percent of refueling vapors
1990年洁净空气法修正案要求机动车随车配备控制约90 %补给燃料汽化系统。 |
