Ключевые слова: adult, approved, arm, assistance, background, black, body, business, card, caucasian, check, communication, concept, finger, gesture, give, giving, green, greeting, hand, holds, human, idea, index, isolated, man, mark, object, one, palm, people, person, pressing, showing, sign, skin, success, symbol, threedimensional, thumb, virtual, white, with, wrist, young,