A freight ship loads cargos at Huanghua Port in Cangzhou City, north China's Hebei Province, Dec. 30, 2020. By Dec. 29, 2020, the annual throughput of Huanghua Port has reached over 300 million tons, with a year-on-year increase of 5.17 percent. (Photo by Yuan Liwei/Xinhua)

Cranes handle containers at Huanghua Port in Cangzhou City, north China's Hebei Province, Dec. 30, 2020. By Dec. 29, 2020, the annual throughput of Huanghua Port has reached over 300 million tons, with a year-on-year increase of 5.17 percent. (Photo by Yuan Liwei/Xinhua)

A freight ship loads cargos at Huanghua Port in Cangzhou City, north China's Hebei Province, Dec. 30, 2020. By Dec. 29, 2020, the annual throughput of Huanghua Port has reached over 300 million tons, with a year-on-year increase of 5.17 percent. (Photo by Yuan Liwei/Xinhua)

A freight ship stops at Huanghua Port in Cangzhou City, north China's Hebei Province, Dec. 30, 2020. By Dec. 29, 2020, the annual throughput of Huanghua Port has reached over 300 million tons, with a year-on-year increase of 5.17 percent. (Photo by Yuan Liwei/Xinhua)