| 1. | They may contain toxic substances which have an adverse effect on biological systems .
工业废水中含有对生物处理系统有不良影响的有毒物质。 |
| 2. | Accumulation of toxic substances in the biosphere is causing serious changes in the structure and function of natural ecosystems .
生物圈内有毒物质的积累，造成了天然生态系统的结构与功能的严重变化。 |
| 3. | Workplace air . determination of toxic substances . collectors
车间空气中有毒物质的测定.收集器 |
| 4. | Workplace air . determination of toxic substances . sampling strategy
车间空气中有毒物质测定采样规范 |
| 5. | Release no toxic substance after incineration
燃烧时没毒气释放 |
| 6. | Terrorists have released a toxic substance
恐怖分子已向空气中 |
| 7. | Synergistic effects of toxic substances
有毒物质的协同效应 |
| 8. | Toxic substances monitoring programme
有毒物质监测计划 |
| 9. | Classification of health hazard levels from occupational exposure to toxic substances
职业性接触毒物危害程度分级 |
| 10. | Current status of determination technology of harmful and toxic substances in coatings
涂料中有害物质的检测技术研究现状 |
