Xu Collection, Middle Volume, Radical: Mound (fù) Stroke count: 13 Page 1347, Entry 17 Pronounced wū (entering tone) from the rhyme dictionary "Tang Yun," at the sound of "ge" from "yu ge qie." Also pronounced wū (entering tone) from the rhyme dictionaries "Ji Yun," "Yun Hui," and "Zheng Yun," at the sound of "ge" from "yi ge qie." The pronunciation is the same as "e". "Shuowen Jiezi" explains it as "to block." "Guang Yun" explains it as "to restrict, to hinder." In "Historical Records - Annals of Vassals Since the Founding of Han (Han Xing Yi Lai Zhu Hou Nian Biao)," it is recorded: "Grasping the strategic and blocking geographical advantages." Also in "Guang Yun," it is explained as "dangerous, pressing." In "Book of Han - Annals of Emperor Yuan (Yuan Di Ji)," it is recorded: "The common people suffered calamities and hardships for consecutive years." Also pronounced wū (entering tone) from "Guang Yun," "Ji Yun," and "Zheng Yun," at the sound of "xie" from "wu xie qie." The pronunciation is the same as "e". "Yu Pian" explains it as "strategic, blocking." "Guang Yun" explains it as "blocked and impassable." In "Historical Records - Treatise on Rites (Lu Shu)," it is recorded: "Later, they will gather troops and rely on strategic points for defense." In "Book of Han - Table of Vassal Kings (Zhu Hou Wang Biao)," it is recorded: "As for the narrow space between the Yellow River and the Luo River." Note: Ying Shao said: "E, means narrow." Also, "Guang Yun" records: "E mo, describes steep mountain terrain." Also, the rhyme is read as "yu." In "Hu Guang - Ode to the Sili Colonel (Si Li Xiao Wei Zhen)," it is written: "The Great Han is adaptable and resourceful, valuing magnanimity and simplicity. Spreading a net large enough to swallow boats, to cross difficulties and dangers." "Yu Pian" records: It is the same as the character "ai." "Ji Yun" records: It is the same as the character "e." The explanations of "e" and "ai" can be referenced.