China's steel-making process is like from the 22nd century, and Chinese enterprises in Serbia have done a lot to preserve Serbia's nature and environment, Zarko Micin, the mayor of Novi Sad, Serbia, told CGTN reporter Cherry Qiu during a visit to Nanjing Iron and Steel Group. Meanwhile, Serbian President Aleksandar Vucic is paying a state visit to China from May 24 to May 28.