If I integrate the concentration of smoke, which means the amount of smoke per unit volume over d, I will get the total amount of smoke in d, except, well, let's see.
如果对烟雾的浓度积分，浓度就是区域d中，单位体积的烟雾的量，我们就得到了烟雾的总量。
2
Poisonous and harmful smoke flow with a certain volume, temperature, concentration and density will be generated during explosion in a coal mine.
当煤矿井下发生爆炸时会产生一定体积、温度、浓度及密度的毒害烟流。
3
Based on an analysis of the predicted volume and flow field of the smoke generated in case of fire, sets up a mathematical model and works out its numerical solution.