China targets an economic growth of 4.5 to 5 percent this year and will strive for better in practice. Unlike recent years, the growth target is no longer a single number but a range – a change that's drawn widespread attention. What are the reasons for this move? Let's break things down. (Produced by Wang Tian, Ni Tao, Chen Lidan, He Jieqiong, Wang Xiangyu, Di Jingyuan, Xie Runjia and Li Mingzhi)