toxic substances meaning in English

有毒物质
有害物质

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。
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。
Workplace air . determination of toxic substances . collectors
车间空气中有毒物质的测定.收集器
Workplace air . determination of toxic substances . sampling strategy
车间空气中有毒物质测定采样规范
Release no toxic substance after incineration
燃烧时没毒气释放

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