What is the origin of Hedong in thirty years and Hexi in thirty years?

Thirty years in Hedong, thirty years in Hexi is a saying that is widely circulated in China. Therefore, it is a summary of Chinese culture among the people. It is summarized by Chinese people based on some specific phenomena or some allusions. Yes, it is more philosophical or contains a certain amount of truth. Even in modern times, there are many Chinese proverbs that are still widely quoted by everyone.

Because the management of the Yellow River in ancient times was actually not that good, because the Yellow River was prone to flooding, the Yellow River here has always been an important matter in every dynasty, and people on the banks of the Yellow River were always worried. The mouth of the Yellow River is in danger because there is a lot of sediment in the Yellow River, which is easy to deposit on both sides of the river bank.

If a flood occurs or the sediment accumulation is too serious, it will easily cause the flow of the Yellow River to change its course. After the flow of the Yellow River changes its course, the east of the river may become Hexi and Hexi, and it may become Hexi. It became Hedong. So the so-called thirty years in Hedong and thirty years in Hexi refers to the uncertain changes in the course of the Yellow River.

Nowadays, most of us use 30 years in Hedong and 30 years in Hexi to describe such a phenomenon. In other words, fate will keep changing. Today you have an advantage, but you may not be able to do it tomorrow. It is more advantageous to switch to him, because there is no constant thing in this world, everyone is in a state of movement or change.

So everyone likes this sentence to describe the vagaries of the world, and this sentence itself is easy to remember and smooth, so it is spread in many film and television works or in people's taste of life. It's becoming more widespread. There are so many sayings like this in China that they have even become a language art for us Chinese.