Ключевые слова: abstract, background, blue, body, building, clay, clean, clear, concept, conduit, construction, design, development, ecology, environment, environmental, equipment, flow, good, hand, high, home, horizontal, human, industrial, industry, liquid, material, metal, new, occupation, outdoors, people, person, plastic, plumbing, pollution, protection, repair, safety, sand, surface, system, technology, washing, water, white, work,