| 1. | Power plants that burn coal add greatly to air pollution .
燃煤的发电厂大大地加重了空气的污染程度。 |
| 2. | Stricter limits on pollution levels must be imposed
要采取更严厉的措施，控制污染程度。 |
| 3. | Pollution levels fall during nightime
夜晚的污染程度则会下降。 |
| 4. | For example : to inspect the bacterial accounts in the drinking water
如监测饮用水细菌污染程度。 |
| 5. | There is less air pollution in sunshine town than in other areas of beijing
阳光城的空气污染程度比北京其它的地方要少得多。 |
| 6. | Smoking cigarettes adds to the general levels of air pollution as well as damaging our health
吸烟不仅对健康有害，而且增加空气污染程度。 |
| 7. | What measures have been or are being adopted by the local government to reduce air pollution
当地政府已经采取了或正在采取哪些措施来降低空气污染程度？ |
| 8. | Pollution levels tend to be at their lowest during spring and autumn when winds are freshest
春秋天时候，风带来新鲜清新的空气。因此，污染程度也最低。 |
| 9. | Application of principal component analysis in the comprehensive evaluation on high eutrophication of lakes
主成分分析在湖泊富营养化污染程度综合评价中的应用 |
