Xinghua Elementary School is located at the foot of Yangmingshan Mountain. In such an environment, it is often filled with smoke, adding a mysterious veil to the school. It is precisely because of the weather in Sanzhi that "water" may have many different roles in the hearts of Xinghua children. It may be the inconvenience on rainy days, it may be the irrigation for grandfather's rice planting, or it may be the inability of mother to cook soup. Indispensable materials... Water is as important to human beings as oxygen. We want to start from the perspective of human health. Although the water we touch every day is colorless and odorless, we can tell through scientific experiments that there are many substances in the water. Different substances, some are good for health, and some are poisonous to the body. How can scientists from the water company conduct experiments and tests to take care of the health of the people across the country? From this perspective, let children have a comprehensive understanding of water.