Cao Ziyang (R), a high-speed train conductor, receives the COVID-19 vaccine in Jinan, east China's Shandong Province, Feb. 5, 2021. Working as a conductor of high-speed trains in Jinan section, Cao has been fighting against the COVID-19 epidemic since its beginning. He delivered epidemic prevention supplies to Wuhan many times in 2020, and has been working as volunteer in the community he lives in. (Xinhua/Wang Kai)