Gu tong "ya"
"Shit, Shi-Volume 81 of Biography of Historical Records of Lian Po says that the king of Zhao sent an envoy to see veteran Lian Po, and the envoy replied,' However, if you sit with the minister, you will lose your arrow.' Suoyin:' Convenient number. Meaning: Lian Po sat for a while, and then went to defecate three times. Stool solution vector. Veterans fight with arrows. Here, if the "arrow" is interpreted as the "arrow" of war, it is a thousand miles away. Vector and shit are synonyms. It's a long story I personally know it. Before liberation, people in ethnic minority areas who were exploited by the rule had no money to study, lacked scientific knowledge and didn't know how to use human excrement as fertilizer. Generally, there were no toilets for defecation and they were used to defecating everywhere. In the secluded open space, you can often see rows of hard excrement residue left in the stool, like the arrangement of arrows (arrows), so excrement is called arrows. Before liberation, I made a social survey in Judas Township, Rongjiang County, Guizhou Province, which I saw with my own eyes. It is for this reason that the ancients called vectors' shit'. "(quoted from Huang Xianfan's A Preliminary Study on the Interpretation of Ancient Books-Selected Academic Papers of Huang Xianfan, Guangxi Normal University Press, July 2004).