China is also called China, Midsummer, Middle-earth and China. China and Xia used to be common, and these two words are synonyms. It is summer in China. China is also called midsummer. For example, ten years after Zuo Zhuan was written, Confucius said, "Don't seek summer, don't mess with China." The "Hua" here is also "Xia". Confucius regarded "Xia" and "Hua" as synonyms. In Oracle Bone Inscriptions, the word "Hua" occupies a high position.