日本大东文化大学濑户口律子教授所著《琉球官话课本研究》(香港中文大学中国文化研究所、吴多泰中国语文研究中心 1 994年出版 )一书是用中文撰写的。这部著作为我们描述了明清时期琉球官话课本中所表现出的近代官话的基本面貌。濑户口律子教授本人就是日本冲绳县久高岛人 ,她 The book “Ryukyu Mandarin Textbook Research” (Chinese Culture Institute of the Chinese University of Hong Kong, Wu Tautai Chinese Language Research Center published in 1994) is a book in Chinese written by Seto Ogura, a professor at Daiwa University of Culture in Japan. This book serves as a description of the basic features of modern official Chinese in the Ryukyu mandarin textbooks during the Ming and Qing Dynasties. Seto mouth law professor himself is a long island in Okinawa Prefecture, Japan, she