汽车和工厂烟囱所排出的烟是有毒的。
汽车排出的烟是造成烟雾的主要原因之一。
Automobile exhaust fumes are one of the major caueses of smog.
柴油机在起动后的暖机过程中排出大量含有未燃碳氢(HC)的蓝烟，给人类健康和社会环境都带来极大的危害。
When direct injection diesel engines are warmed up after running from cold start, they will emit a lot of blue smoke containing unburned hydrocarbons (HC) which are harmful to people and environment.
在烹调区有排烟罩和烟道，能保证燃料以及烹调产生的烟、气体等的排出。
Provide for smoke hoods and flues above cooking ranges to enable the removal of fuel and cooking gases, smoke and fumes from the centre into the open air.
水管设在烟管（5）内增加了烟道中的传热面 积，使排出烟的温度降低；
The water pipe set inside the smoke pipe (5) increases the heat transmission area, cooling down the exhaust temperature.
汽车排出来的烟使空气变得肮脏。
汽车排出来的烟使空气变得肮脏。
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