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36 appearance
37 symbol
38 decades
39 exported
40 apparent
41 percentage
42 combination
43 convenient
44 Our air quality now suffers from the effects of pollutants emitted directly from our cars.
45 The problems caused by motorized vehicles in the West are often magnified in developing nations.
46 Movement in some cities comes to a virtual standstill as motorized traffic competes with bicycles and pedestrians.
