2. In ancient times, eight feet was one search. "A thousand searches" describes extremely high or long. From "Wu Du Fu". Wu Du Fu, the author Zuo Si, Western Jin Dynasty literary scholar. Word too Chong. Linzi (now Shandong Zibo) people. Born and died is not known. His family lineage Confucianism. When he was young, he studied calligraphy and qin, all failed, and then because of his father's motivation, he was furious and diligent study. Zuo Si looks ugly mouth mute, not good to socialize, but the rhetoric is magnificent, had spent a year to write "Qidu Fu" (the full text has been anonymous, a number of anonymous text scattered in the "Shui Jingji" and the "Taiping Yuban").