Yu (yǔ), Zhou (zhòu), the four directions up and down are called Yu, and it has been called Zhou throughout the ages. ——"Xinhua Dictionary"
In the diversified Chinese language, "Yu" represents the four directions above and below, that is, all space, and "Zhou" represents the past and present, that is, all time. Yu: infinite space, universe: infinite time. So the word "universe" means "all time and space". Linking the concept of "universe" with time and space reflects the wisdom of ancient Chinese people.
The word "universe" first came from the book "Zhuangzi". "Yu" refers to all space, including east, south, west, north and other places, which is boundless; "Zhou" refers to all time, including past, present, day, night, etc., which has no beginning or end.
"Yu" refers to space, and "Cosmos" refers to time. The universe is a material world that is boundless in space, has no beginning and no end in time, and moves according to objective laws. The universe is the general term for all things and the unity of time and space. The universe is a material world that exists objectively independent of human will and is in constant motion and development. The universe is diverse yet unified. It includes everything and is the unity of all time and space. Without time and space, there is nothing. So it encompasses it all.