Traditional Chinese medicine is composed of traditional medicine from Han, Tibetan, Mongolian and other ethnic groups. It has the mystery of traditional oriental medicine, and often contains myths and legends. Many of its principles cannot be used in modern medicine. The theory explains the science. But this "mysterious" medicine often has magical effects. For example, Tibetan medicine, for a long time, treats patients with plants, animals, minerals and foods unique to the Qinghai-Tibet Plateau. It has a good effect on a variety of diseases that make modern medicine difficult, including cancer and stroke. What does this text mainly explain? ['The composition and characteristics of traditional Chinese medicine.', 'Therapeutic principles of traditional Chinese medicine.', 'Chinese traditional medicine has magical effects.', 'Differences between traditional Chinese medicine and modern medicine.']