Ключевые слова: blue, building, building material, business, cargo, cement, charge, city, construction, container, container crane, crane, dock, dockside, environment protection, europe, export, freight, germany, gravel, harbor, heavy, import, industrial, industry, infrastructure, inland, inner harbor, load, machine, mannheim, material, metal, outdoor, plans, port, rhine, sand, ship, shipping, sky, trade, transport, transportation, water, work, yellow,