Ключевые слова: application, arrow, background, black, buttons, cleaning, computer, concept, connection, conservation, container, cutout, cyberspace, dark, datum, document, dust, ecosystem, environmental, eraser, graphic, icon, infrastructure, junk, laptop, material, message, plastic, pollution, privacy, problem, protection, receiving, recycling, render, round, safety, security, send, service, threedimensional,