It means: to see all the spring and autumn events in the world (the ups and downs of the world).
From Mao Zedong's "Niannujiao Kunlun", excerpt from the original text:
He was born in Kunlun, and read all the spring scenery in the world. Three million jade dragons flew up, causing the whole sky to become cold. In summer, when the water melts and rivers overflow, people may become fish and turtles. Who has ever commented on the meritorious deeds of a thousand years?
Translation:
Breaking out of the sky, into the vast Kunlun Mountains, you have seen all the spring and autumn events in the world. Thousands of ice edges flew up from your snow-capped body, and the sky was chilled to the bone by you. In summer, your ice and snow are melting, rivers are flowing, and some people may be buried in the belly of fish. Who has commented on your merits and demerits for thousands of years?
Extended information
Creative background:
This poem was written by Mao Zedong in 1935. At that time, the Central Red Army had completed the last leg of the Long March and was about to arrive in northern Shaanxi. Mao Zedong was inspired when he climbed to the top of Minshan Mountain and looked at the vast Kunlun Mountains in Qinghai.
About the author:
Mao Zedong (December 26, 1893 - September 9, 1976), also known as Runzhi (originally Yongzhi, later changed to Runzhi), pen name Zi appoint. A native of Xiangtan, Hunan. Leader of the Chinese people, Marxist, great proletarian revolutionist, strategist and theorist, main founder and leader of the Communist Party of China, the Chinese People's Liberation Army and the People's Republic of China, poet, calligrapher Home.
From 1949 to 1976, Mao Zedong served as the supreme leader of the People's Republic of China. His contribution to the development of Marxism-Leninism, military theory, and theoretical contributions to the Communist Party are known as Mao Zedong Thought. Because almost all of the major positions Mao Zedong held were called chairman, he was also known as "Chairman Mao".
Baidu Encyclopedia-Nian Nujiao·Kunlun