1. Mopping the floor, flushing toilets, raising fish, raising flowers, cleaning windows, drinking water, cleaning, cooking, cooking, washing clothes, etc.
2. Water: an inorganic substance composed of hydrogen and oxygen, which is a colorless and odorless transparent liquid under normal temperature and pressure. Water is one of the most common substances, an important resource for the survival of all life including human beings, and also the most important component of organisms. Water plays an important role in the evolution of life. Human beings began to understand water very early. Water was regarded as a basic constituent element in the simple material concepts of ancient East and West, and water was one of the five elements in ancient China; There is also water in the four element theory in ancient western countries.
3. In the early days of civilization, people began to explore the composition or classification of various things in the world, in which water played an important role. The four elements theory put forward by the ancient West includes water; The four major Buddhist schools also have water; In the Five Elements Theory of ancient China, water represents all liquids, as well as things with flowing, wetting and feminine properties.