Many uses are related to the Yellow River. This is because China was dominated by agriculture for thousands of years in ancient times, and agriculture needed irrigation. Therefore, where there are rivers, there is human civilization, such as the two river basins, around the Nile, where there are water sources, with dense population and relatively developed human civilization. Moreover, the Yellow River is the mother river of human beings, which breeds the descendants of human beings on both sides of the Yellow River, and human beings respect the Yellow River. Therefore, many solemn idioms are mostly related to the Yellow River.

Original, hope to adopt.