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1. ( megacity, cosmopolitan, office block, public transport ) - a really big city, usually with a population of more than 10 million people
2. ( public transport, megacity, cosmopolitan, office block ) - transport that everyone can use, such as buses and trains
3. ( cosmopolitan, megacity, public transport, office block ) - containing people from lots of different cultures/countries
4. ( office block, urban area, skyscraper, terraced house ) - a large, high building containing offices