The residue found in third-hand smoke includes heavy metals, carcinogens and, even radioactive materials that are dangerous to children.

三手烟残余中包含有重金属、和致癌物质，特别是放射性物质对儿童是危害重大的。

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The residue includes heavy metals, carcinogens and even radioactive materials that young children can get on their hands and ingest, especially if they're crawling or playing on the floor.

这些包括重金属，致癌物资甚至放射性物资在内的残余物，沾满了婴幼儿的双手甚至被他们的呼吸道吸收。当婴幼儿在地板上爬行或者玩耍时，所受的污染尤甚。

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However, we have to see the following radon and radioactive pollution in industrial waste residue.

然而工业废渣中存在着氡和放射性污染。

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However, we have to see the following radon and radioactive pollution in industrial waste residue.

然而工业废渣中存在着氡和放射性污染。

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