Riddle analysis: Calm means that there is no wind and waves, as if nothing had happened, and it means calm and nothing happened. From Song Shi Puji's "Five Lights Meeting Yuan" Volume 7: "The monk asked,' How is it when it is calm?' The teacher said,' Blow down the south wall.' "Since it is calm, it must mean that there is no wind and waves on the water, and the waves are very quiet, so it is Ningbo.

Brief introduction of Ningbo

Ningbo, referred to as "Ningbo" for short, is a sub-provincial city under the jurisdiction of Zhejiang Province, a city with separate plans, an important port city in the southeast coast of China and the economic center in the south wing of the Yangtze River Delta approved by the State Council.

Ningbo is located in the east of China, on the southeast coast, in the middle of the mainland coastline, in the south wing of the Yangtze River Delta, with Zhoushan Islands as a natural barrier in the east. Ningbo is a typical Jiangnan water town and seaport city. It is the southern port of China's Grand Canal and the eastern port of origin of the Maritime Silk Road. The annual cargo throughput of Zhoushan Port in Ningbo ranks first in the world, and the container volume ranks top three. It is a multifunctional, comprehensive and modern deep-water port integrating inland river port, estuary port and seaport.