Which cities have higher temperature in Feb than in Jun or have once served as host cities?
SELECT T1.city FROM city AS T1 JOIN temperature AS T2 ON T1.city_id  =  T2.city_id WHERE T2.Feb  >  T2.Jun UNION SELECT T3.city FROM city AS T3 JOIN hosting_city AS T4 ON T3.city_id  =  T4.host_city
SELECT T1.city FROM city AS T1 JOIN temperature AS T2 ON T1.city_id  =  T2.city_id WHERE T2.Feb  >  T2.Jun UNION SELECT T3.city FROM city AS T3 JOIN hosting_city AS T4 ON T3.city_id  =  T4.host_city
[{'City': 'Jiaxing ( Zhejiang )'}, {'City': 'Nanjing ( Jiangsu )'}, {'City': 'Shanghai'}, {'City': 'Taizhou ( Zhejiang )'}, {'City': 'Wuxi ( Jiangsu )'}]