[Spring Health Preservation] Teacher Zhang Wuben introduced that in the "Yellow Emperor's Inner Canon", it says: "A person corresponds with the laws of the universe, and is in harmony with the changes of the sun and moon." This means people should follow the natural laws of nature for health preservation. Based on daily life experience, in spring, if we want to avoid getting sick or get sick less, we can adopt the following several simple and easy-to-implement methods for preventing and treating diseases.