Ключевые слова: ability, aptitude, boy, child, communication, counting, data, demonstrate, display, exhibit, expose, expression, faculty, fingers, gesture, girl, hand, human, indicate, information, intelligence, intent, kid, knowledge, math, meaning, message, number, person, power, preadolescent, present, purpose, reveal, show, sign, skill, strength, symbol, talent, teenager, ten, understanding, wisdom, youngster, youth,