exhaust

因此，由于废气排放，它可能会造成严重的污染。

Therefore, it might cause a great deal of pollution because of ___exhaust fumes.

汽车废气是造成城市空气污染的重要因素。

Car ___exhaust fumes contribute significantly to urban air pollution.

现代发动机的设计旨在减少有害废气的排放。

Modern engines are designed to reduce harmful ___exhaust emissions.

一阵响亮的嘎嘎声从汽车的排气管传来。

A loud rattling sound came from the car's ___exhaust.

排气管排出的烟雾加剧了城市的雾霾问题。

The fumes from the ___exhaust were contributing to the city's smog problem.

机修工发现排气管上有一道裂缝，正是泄漏的源头。

The mechanic identified a crack in the ___exhaust as the source of the leak.