There are many sources of air pollution; exhaust fumes, for example.
空有许多来源, 例如废。
There are many sources of air pollution; exhaust fumes, for example.
空有许多来源, 例如废。
California's air pollution guidelines are stringent.
加州制定的空标准很严格。
Air pollution in the city had reached four times the acceptable levels.
这座城市的空程度曾高达可接受标准的四倍。
Setting off firecrackers makes a tremendous noise and causes serious air pollution.
燃放鞭炮会产生巨的噪声,严重。
This article summarized the indicating function of bryop hyte to air pollution, heavy metal pollution and mineral resources.
综述了苔藓植物对、重金属和矿藏的的监测指示作用。
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