Test analysis: "Japan" mentioned in the dry materials is another name of Japan in history, and "cassock", "fold" and "Purdue sentient beings" are all related to Buddhism. In the Tang Dynasty, a monk named Jian Zhen traveled to Japan to preach. He came to Japan for the sixth time. In addition to teaching Buddhist scriptures, he also introduced China's medical, architectural, sculpture, literature, calligraphy, painting and other technical knowledge in detail, making outstanding contributions to the economic and cultural exchanges between China and other countries in the world.