Visitors look at the 5G intelligent system exhibition booth of China's Huawei at the 2019 World 5G Convention in Beijing, capital of China, Nov. 21, 2019. Themed "5G changes the world, 5G creates the future," the 2019 World 5G Convention kicked off Thursday in Beijing. (Xinhua/Li Xin)

An exhibitor shows an AR technology that can restore historical relics during the 2019 World 5G Convention in Beijing, capital of China, Nov. 21, 2019. Themed "5G changes the world, 5G creates the future," the 2019 World 5G Convention kicked off Thursday in Beijing. (Xinhua/Peng Ziyang)