These irritants may include dust and pollution, cigarette smoke, and other irritants.
这些刺激可能包括灰尘和污染，香烟烟雾，和其他刺激物。
These direct light downward to reduce light pollution and light at night.
这些向下的直射光减少了夜晚的光污染。
As far as these mountain villagers are concerned, pollution is not yet a big threat.
就这些山区村民而言，污染目前尚不是一个大威胁。
These direct light downward to reduce light pollution at night.
这些向下的直射光减少了夜间的光污染。
These factories cause little pollution for the city.
这些工厂造成污染的小城市。
These factories cause little pollution for the city.
这些工厂造成污染的小城市。
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