Ключевые слова: adult, blue, button, caucasian, closeup, computer, concepts, control, electrical, electricity, engineer, equipment, finger, focus, hand, human, indoors, industry, instrument, keyboard, keypad, knob, lighting, machinery, males, men, musical, night, object, occupation, one, panel, person, playing, power, pressing, professional, push, pushing, science, selective, single, supply, switch, technology, touching, unrecognizable, working,