poisonous substances

There's absolutely no regulation of cigarettes to make sure that they don't include poisonous substances...

根本没有法规来确保香烟不含有毒物质。

《柯林斯高阶英汉双解学习词典》

Even when the machines are recycled and the harmful metals removed, the recycling process often is carried out in poor countries, in practically uncontrolled ways which allow many poisonous substances to escape into the environment.

虽然机器被回收了，有害金属也被清除了，但这个过程通常是在贫穷国家进行，管控也不到位，导致很多有毒物质最终流到了环境中。

高考真题- 2015 江苏 阅读B

The alchemists who worked in these apothecaries suffered a considerable risk to their health, working so invariably close to poisonous substances.

在药店里工作的炼金术士还要面对极大的健康风险，因为他们的工作地点总是有有毒物质。

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There's absolutely no regulation of cigarettes to make sure that they don't include poisonous substances

根本没有法规来确保香烟不含有毒物质。

柯林斯高阶英汉双解学习词典

Cyanide and Cr ( VI ) are highly poisonous substances that cause serious environmental pollution when discharged arbitrarily.

氰化物和六价铬都是剧毒物品,随意排放会导致严重的环境污染.

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Acetone, highly toxic hydrocyanic acid and sulphuric acid are used as raw materials in traditional method to produce MMA. The seriously poisonous substances and the strong acid not only results in the obvious environment pollution, but also results in the numerous ammonium bisulfate byproduct.

MMA传统的合成方法是以丙酮、剧毒的氢氰酸和硫酸为原料，不仅是非环境友好工艺，且副产大量硫酸氢铵。

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poisonous substances

有毒物质

朗文当代高级英语词典 第6版