| 1. | Contamination can't be ruled out entirely .
污染是不能完全清除的。 |
| 2. | The brass surface must be free of contamination .
黄铜表面必须未经沾污。 |
| 3. | Such contamination has been extensively studied .
人们对这种污染进行了大量研究。 |
| 4. | There is less danger from insect and disease contamination .
病虫侵染的危险较小。 |
| 5. | Can the blood of the westerns submit to your contamination ?
魏斯顿家清白的血统能让你去糟踏吗？ |
| 6. | It is important to take stringent precautions against contamination in the lab .
必须特别注意实验室的污染。 |
| 7. | The external surface of culture vessel is, of course, subject to contamination .
培养器皿的外面当然是被污染的。 |
| 8. | Vegetables are subject to contamination by food handlers after harvesting .
蔬菜通常是收获后被食品加工人员污染的。 |
| 9. | If sound seeds result, precautions against contamination must be tightened .
假如结了正常的种子，则防止混杂必须更严。 |
| 10. | Contamination with viruses occures in experimental green houses and in the open .
在实验温室和室外都能发生病毒的污染。 |
