Ключевые слова: action, arrow, attitude, business, choice, circle, clear, closeup, cog, complex, complicated, concept, confused, connection, decision, difficult, direction, easy, education, effortless, elementary, frustration, gear, guidance, hard, industry, information, iron, life, machinery, mechanism, metal, old, opportunity, option, paradox, perspective, problem, progress, relationship, response, sign, simple, steel, stress, teamwork, technology, uncertainty, way, wheel,