Ключевые слова: abstract, background, business, center, city, communication, computer, concept, connections, desktop, digital, double, downtown, electronic, email, envelop, exposure, financial, icon, information, interactive, internet, letter, mail, message, online, particle, pc, plan, professional, screen, send, shanghai, skyline, skyscraper, social, social email, society, software, spam, sunrise, symbol, talk, technology, training, view, web, webinar, writing,