城市建设中应该保持old building呢还是应该用new building replace old building?

The question of whether new building should replace old building is a controversial one.While new buildings might indicate a city's level of development and technology,old buildings remind us of a city's rich history and unique heritage.To me,the question of whether old buildings or new buildings is not important; the important question is how the city wants to shape itself.
The Unite States is a country full of dream and miracles.Its capital city,New York is full of modern buildings and desire to "replace the old".People all around the world moves to New York because it is the city of dream and a city of future.New York is obviously successful as a city not because of its new buildings but because its sprite to challenge the old and embrace the new.
Alternatively,Rome is city that has kept its old buildings.Who can say Rome is not a great city?To many,it is just as a great city as New York.Its many heritage buildings remind travelers of its rich history and makes people admire their ability to design such strong and long lasting buildings.Again the example shows how whether new or old buildings are unimportant,it is the soul of the city that shapes its buildings.