oil smoke discharge 油烟排放
smoke discharge system 烟气排放系统
Discharge clouds of smoke 排出滚滚浓烟
ventilation and smoke discharge 通风排烟
smoke dust discharge concentration 烟尘排放浓度
Factories chimneys discharge smoke into the atmosphere.
一股黑烟从烟囱中冒出。
Factory chimneys discharge smoke into the atmosphere and make it dirty.
工厂的烟囱往空气里排烟，造成大气污染。
Two trapping methods are discussed in accordance with the situation to disorderly discharge smoke and dust on electric furnace slag field and the features of the smoke and dust.
针对电炉渣场烟尘无组织排放和烟尘性质较为特殊的特点，探讨了两种渣场烟尘捕集方式。
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