Group 1 - The core idea revolves around the historical significance and uses of various aromatic plants, particularly "芸草" (Yun grass) and "兰草" (Lan grass), in ancient Chinese culture, especially in relation to book preservation and fragrance [1][2][14] - "兰台" (Lan Tai) was a significant library in the Western Han dynasty, evolving through various dynasties, with its management and naming conventions changing over time [2][7] - The term "芸香" (Yun Xiang) has become synonymous with the fragrance associated with books, indicating its cultural importance in literature and preservation [14][15] Group 2 - The historical context of "芸草" and its various interpretations, including its medicinal and aromatic properties, highlights the confusion surrounding its identity in ancient texts [3][6][9] - The use of "芸草" in libraries for pest control demonstrates the practical applications of aromatic plants in safeguarding literature [8][16] - The evolution of terminology related to "兰草" and "芸草" reflects the linguistic and botanical complexities in ancient Chinese literature [10][12][13]