“烟，大家都不陌生，战场上的浓烟滚滚，乡村间的炊烟袅袅等等。可是，当烟一旦与火在一起，成了火魔的帮凶，则后果不堪设想。特别是现在一些化学材料燃烧时所释放出的有毒烟气，更是为祸不小，有统计说明，火灾中被烟熏死的人数大大高于被火烧死的。那么，你清楚烟的特性吗 "Smoke, no stranger to each other, the billowing smoke on the battlefield, the curl of smoke in the countryside, etc. However, when the smoke is together with the fire and becomes the accomplice of the fire demon, the consequences will be disastrous. In particular, some chemical materials Toxic smoke released when burning is even more of a calamity, statistics show that the number of people who were smothered to death in a fire is much higher than that of being burnt to death.