二恶英是一类剧毒物质，可导致生殖和发育问题，损害免疫系统，干扰激素，还可以导致癌症。
Dioxins are highly toxic and can cause reproductive and developmental problems, damage the immune system, interfere with hormones and also cause cancer.
遗憾的是，有少量剧毒物质已经对人体造成了严重副作用。
‘The problem is that there are a few highly toxic things that unfortunately have had very severe effects on people.’
假冒药物范围很广，既有不含任何有效成分的产品，也有含剧毒物质的产品。
Counterfeit medicines range from products containing no active ingredients to those containing highly toxic substances.
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