Ключевые слова: alternative energy, appliance, blue, building feature, business finance and industry, clean, closeup, communication, computer, computer cable, concepts, connection, connection block, copy space, danger, domestic room, efficiency, electric plug, electrical outlet, electricity, empty, environment, equipment, focus on foreground, fuel and power generation, healthcare and medicine, high angle view, home interior, in a row, indoors, industry, innovation, inside of, metal, modern, no people, plastic, power line, power supply, science, selective focus, single object, sparse, switch, technology, wall, wire,