引擎废气抽出；软管转轴；下水道排放；地面及地下抽吸排放。
美国海洋及大气管理局在最近的一项研究中发现，使用低含硫量燃料可以减少百分之90的有害废气。
A recent study by the National Oceanic and Atmospheric Administration (NOAA) found that using this type of fuel reduced harmful emissions by as much as 90 percent.
排气管将一股废气送到了房中，一股熟悉的气息迎面扑来，我的精神为之一振。
The exhaust sent an end gas into our room. How familiar smell that was! And it revivified me.
每天，成千上万吨废气从车辆的排气管排出。
Each day thousands of tons of gases come out of the exhausts of motor vehicles.
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