A staff member talks with his colleague via a walkie-talkie in Manzhouli, north China's Inner Mongolia Autonomous Region, Dec. 30, 2020. The number of China-Europe freight trains arriving and departing via Manzhouli, China's largest land port, reached a record high in 2020 despite the impact of COVID-19, local railway authorities said Wednesday. (Photo by Guo Nailun/Xinhua)

Photo taken on Jan. 5, 2021 shows a gantry crane lifting a container in Manzhouli, north China's Inner Mongolia Autonomous Region. The number of China-Europe freight trains arriving and departing via Manzhouli, China's largest land port, reached a record high in 2020 despite the impact of COVID-19, local railway authorities said Wednesday. (Photo by Guo Nailun/Xinhua)

Photo taken on Jan. 5, 2021 shows a gantry crane lifting a container in Manzhouli, north China's Inner Mongolia Autonomous Region. The number of China-Europe freight trains arriving and departing via Manzhouli, China's largest land port, reached a record high in 2020 despite the impact of COVID-19, local railway authorities said Wednesday. (Photo by Guo Nailun/Xinhua)

Photo taken on Jan. 5, 2021 shows a crane carrying a container in Manzhouli, north China's Inner Mongolia Autonomous Region. The number of China-Europe freight trains arriving and departing via Manzhouli, China's largest land port, reached a record high in 2020 despite the impact of COVID-19, local railway authorities said Wednesday. (Photo by Guo Nailun/Xinhua)

Staff members check information of containers in Manzhouli, north China's Inner Mongolia Autonomous Region, Dec. 30, 2020. The number of China-Europe freight trains arriving and departing via Manzhouli, China's largest land port, reached a record high in 2020 despite the impact of COVID-19, local railway authorities said Wednesday. (Photo by Guo Nailun/Xinhua)