Pronounced guāng (falling tone), as in gēng (falling tone). In the "Jiyun" (Jiyun), pronounced jū (rising tone) with the same pronunciation as "gēng" (falling tone). "Shuowen Jiezi" explains it as "【】". "Jiujing Ziyang" records that the clerical script is written as "更". In the "Book of Rites" (Liji), "Analects of Confucius" (Lunyu) states, "A gentleman asks about the beginning of a change." Also, in the "Book of Rites" (Liji), "Yueliang" (Yueliang) records, "Exchange leather and currency." The commentary explains: "Gēng" means to replace. Furthermore, in the "Records of the Grand Historian" (Shiji), "Cao Xiangguo Shijia" (Cao Xiangguo Shijia) records, "Actions are without any change." Also, in the "Book of Rites" (Liji), "Ruxing" (Ruxing) records, "Then they stayed, and the replacement of servants made it impossible to finish." The commentary explains: "Gēng" means to replace. Also, in the "Records of the Grand Historian" (Shiji), "Pingzhun Shu" (Pingzhun Shu) records, "The taxes and levies of Bashu are insufficient to replace them." The commentary quotes Wei Zhao as saying: "Gēng" means to continue. Some also say "gēng" means to repay. Also, "Yupian" (Yupian) explains: "Gēng" means to experience, to repeat. "Leipian" (Leipian) explains: to take turns, to alternate. Also, in the "Book of Rites" (Liji), "Wen Wang Shizi" (Wen Wang Shizi) records, "Then three elders and five gēng were appointed." The commentary explains: referring to retired individuals who are old and experienced. The commentary on "Book of Later Han" (Hou Hanshu), "Liyi Zhi" (Liyi Zhi) explains: The five gēng elders are those who understand the alternation of the five elements. Also, in the "Book of Former Han" (Qian Hanshu), "Zhaodi Ji" (Zhaodi Ji) records, "The unpaid gēng taxes from before the third year shall not be collected." The commentary explains: There are three types of gēng service: zu gēng, jian gēng, and guo gēng. In ancient times, formal service was not fixed, and everyone was supposed to take turns. A change every month was called zu gēng. The poor wanted to get money for hired service, so the person on duty would hire someone else, which was called jian gēng. Everyone in the world was supposed to guard the border for three days, which was also called gēng, and it is what the law calls yao shu. Those who did not serve paid 300 coins to the government, which the government used for border guards, and this was called guo gēng. Also, changing the water clock's timekeeping due to the passage of time is called gēng. "Ban Gu's Xidu Fu" (Xidu Fu) has, "The guard post of Yan Geng." The commentary explains: It is the official post that supervised the night patrols. Also, "Bao Yin Ji Tan" (Bao Yin Ji Tan) records Yang Wanli's poem: "After returning from heaven, there are six gēng." The commentary explains: After the fifth gēng in the palace, the梆 drum was struck in four places, called the toad gēng. As soon as the palace gates opened, officials entered, which was called the sixth gēng. It is also an official title. "Book of Former Han" (Qian Hanshu), "Baiguan Gongqing Biao" (Baiguan Gongqing Biao) records, "The Crown Prince Shu Geng Jia Ling." The commentary by Shi Gu says: He was in charge of knowing the water clock, hence he was called Shu Geng. Also, "Guangyun" (Guangyun) and "Jiyun" (Jiyun) pronounce it as gǔ (falling tone) měng (falling tone), with the same pronunciation as "gèn" (falling tone). "Zengyun" (Zengyun) explains: it means again. Also, "Yunbu" (Yunbu) rhymes with jū (rising tone) liáng (rising tone). Sima Xiangru's "Changmen Fu" (Changmen Fu): "Looking at the courtyard, it is vast and expansive, like the frost falling in late autumn. The night is long and endless like the year, and my heart is filled with sorrow and cannot be renewed." Proofreading: ["Book of Rites" (Liji), "Yueliang" (Yueliang) "Yi Pi Bi". Commentary: "Yi, like Geng."]. According to the original text, "Yi Pi Bi" is changed to "Geng Pi Bi". "Yi you geng ye" is changed to "Geng you yi ye". ["Zhang Heng's Xidu Fu" (Xidu Fu)]. According to the original book, "Zhang Heng" is changed to "Ban Gu".