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which is the most important thing for the city ？,Is the famous historical sites ？,Maybe is the fresh air？,Is the delicious food ？,Of course ,it is impossible to avoid these all!,But I think the most important is traffic!,When you cross the road , you may see.,Are you familiar with this,Now I want to introduce a city to you!,When you cross the road You may see,This is my hometown -HangZhou,Why HangZhou can solve this problem？,