抽烟产生的烟雾是一种混合的气体，包括气化的化学物质，极小的灰末微粒和其它固体，还有毒性很强的尼古丁和黑焦油。
Smoke is a mixture of gases, vaporized chemicals, minute particles of ash, and other solids. There is also nicotine, which is a powerful poison, and black tar.
危险废物就是指任何含有对人类致命的，有毒的，致癌的，可燃，腐蚀性的，或爆炸的物质的废弃材料、液体或固体。
Hazardous waste is any discarded material, liquid or solid, that contains the substances to be fatal, toxic, carcinogenic, ignitable, corrosive, or explosive to humans.
铸造生产的两大污染源，一是使用含有有毒物质的树脂黏结剂，二是排放的废砂成为大量固体废物。
In foundry production, two great pollution sources are use of resin binders containing toxic matters and large amount of solid garbage resulting from waste sands.
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