The "trillion club" has added a new member.On January 15, Changzhou City, Jiangsu Province, announced that its gross domestic product (GDP) will exceed 1 trillion yuan in 2023. This means that Changzhou has become the fifth city in Jiangsu Province to enter the "trillion club" after Suzhou, Nanjing, Wuxi and Nantong. So far, the number of cities with trillions of GDP in the country has reached 25, and Jiangsu has also become the province with the most trillion cities.How did Changzhou get the ti