将下面改写学术、精炼一点The development of hic in first-tier cities such as Beijing Shanghai Guangdong and Shenzhen far exceeds that of other cities and the growth accelerated after 2015 which opened the gap with

The development of human and artificial intelligence (AI) in first-tier cities, such as Beijing, Shanghai, Guangdong, and Shenzhen, has far surpassed that of other cities. This growth has accelerated since 2015, leading to a widening gap between these cities and others. In 2019, the coordinated development of human and AI reached 0.69, indicating an effective coordinated development situation. Similarly, new first-tier cities and second-tier cities have experienced significant growth during the study period, with a stronger growth trend observed after 2015. However, the gap between these cities and first-tier cities has also widened to some extent after 2015. On the other hand, third-tier cities, fourth-tier cities, and fifth-tier cities have seen a slight increase in human capital and AI, but the degree of coupling between the two remains low.