Xinyi's four words are: hard work, hard work, hard experience, hard work, hard work, hard work and so on. Chinese characters have been used for the longest time, and they are also the only inheritors of the ancient Otomachi system. Chinese characters have always been the main official language in China. In ancient times, Chinese characters were also used as the only international communication language in East Asia. Before the 20th century, they were still the official written standard characters of Japan, the Korean Peninsula, Vietnam and Ryukyu, and all East Asian countries created their own Chinese characters to some extent. Japanese, Korean Peninsula, Vietnamese and other countries are deeply influenced by China culture in history, and even other languages have borrowed Chinese characters.