根据这个协议，致癌化学物的释放将被削减80％左右。

Under the agreement, releases of cancer-causing chemicals will be cut by about 80 percent.

《柯林斯英汉双解大词典》

研究者称氯处理过的水的副产品三卤甲烷（THM)，是一种致癌化学物，会增加患疾病风险。

Researchers say cancer-causing chemicals called trihalomethanes (THM) are created as a byproduct of chlorinating water and increase the risk of the disease developing.

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研究对象的香烟中添加了一种多环芳烃化合物，该物质进入人体后被转化为另一种破坏dna的致癌化学物质。

A PAH was added to the subject's cigarettes, which was then modified by the body and turned into another chemical which damages DNA and has been linked with cancer.

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