toxic substances 有毒物质
toxic waste 有毒废物
environmental toxics 环境污染物
A: What are these substances in the waste?
A：废物里的这些物质是什么？
B: They are toxics that need careful disposal.
B：它们是有毒物质，需要谨慎处理。
1) 有毒物质
2) 毒素
1. 有毒物质
noun
1. Poisonous or harmful substances.
Synonym: toxins, poisons