 Specifically, it included "General remarks on Erya (Erya Lue Shuo, 尔雅略说), which defined and explained the importance of Erya and incorporated his comprehensive summary of past analyses of Erya, including that of Guo Pu (one of the earliest writers on Chinese ancient texts from the first century); "General remarks on Shuowen" (Shuowen Lue Shuo, 说文略说), which studied the etymology of Chinese characters and analyzed the rationale of Chinese orthography; "General remarks on Shengyun" (Shengyun Lue Shuo, 声韵略说), which elaborated on the importance of phonetics and the historical change of Chinese phonetics through the multiple versions and editions of Guangyun spread across dynasties.Upon returning to China after his political exile in Japan, Huang slowly withdrew from direct political involvement and focused on research and teaching.He taught at Peking University, National Central University, Jinling University, Shanxi University, and some others for more than twenty years collectively.