Ключевые слова: action, adjustable, asphalt, automobile, brushes, city, cleaner, cleaning, cleanliness, cleanness, cleans, cleanup, controllable, copy space, dust, environment, equipment, footway, garbage, hydraulically, industrial, industry, machinery, mechanical, motorized, municipal, powered, purity, residential area, road, rotating, routine, rubbish, sanitation, service, small, street, sweepers, sweeping, tidy, transportation, trash, truck, two independently, urban, van, vehicle, waste, way, working,