Ключевые слова: 2021, alternative, building, business, calendar, cell, city, concept, conservation, eco, ecological, ecology, electrical, energy, environment, equipment, evening, exterior, field, grass, green, greeting, happy, holiday, idea, industry, innovation, lawn, meadow, morning, nature, new year, office, outdoor, panel, power, renewable, retro, sky, skyscraper, solar, solution, style, sun, sunlight, sunrise, sunset, sustainable, technology, tower, urban, vintage,