Zhang Shiyu (L) and Lyu Xin put up Spring Festival couplets in north China's Tianjin, Feb. 1, 2019. Zhang Shiyu and Lyu Xin got married in 2018. Although the couple work in Beijing, they chose to buy their wedding house in the neighboring Tianjin City,where Zhang Shiyu was born, given the convenience brought by the Beijing-Tianjin-Hebei integration. They now go to Tianjin every two weeks and return to Beijing on Sunday nights. Thanks to the development of Beijing, Tianjin and Hebei Province -- a regional city cluster called "Jing-jin-ji" , the young couple has a better choice for work and life. (Xinhua/Li Ran)