According to the James Zhou system, there are three types: length and weight, which are worn by staff sergeant, sergeant and corporal respectively, which are called upper system, middle system and lower system. Among them, the upper sword is about 3 feet long, so the sword also has another name of "3 feet". "The Emperor of the Han Dynasty": "I lift three feet with cloth clothes and take the world"; Du Fu's "Re-narration of Zhaoling": "The wind and cloud are three feet swords, and the country is a suit"; Hong Xiuquan's "Sword Poetry": "Hold three feet to determine the mountains and rivers". Because the body of the sword is condensed like autumn water, some people call it "three feet of water", such as Li He's "A Spring Interview with Zhengzi Sword Song": "The ancestral box was three feet of water and once entered Wutan to kill dragons. "Other swords are nicknamed Longquan, Green Snake, Iron Snake, Chutie, Lotus, etc.
2. It refers to the law. In ancient times, legal provisions were written on three-foot-long bamboo slips, so the law was called "three-foot method" or "three-foot method" for short.
Zang Shi wasted three feet in revenge. -Gao Mingqi's "Shubo Chicken" or: "Why is this jester?" Gong Fen said,' I know it's three feet, but I don't know it's a jester'! "-Huang Ming Daozhou Festival Atlas Yuan Gongchuan"
3. refers to the person himself.
Life is three feet, scholar.
4. Regulations and standards of tour guide music.
Shen Jing's Qupu, once regarded as a statute by poets, has now become a must-read for Nanyin legendary writers and opera artists, providing great convenience for the legendary creation in Ming and Qing Dynasties. At the beginning of its publication, in front of a set of systematic and standardized music scores, almost all composers thought that it was published at the right time, because it was "cleverly conceived and made a contribution to acoustic teaching", "better tune but not scattered", "change it without widely teaching, and have to change it", which can reflect the north and south with the rhyme of the Central Plains and breathe a sigh of relief for the south of the Yangtze River. Shen said that the legendary music since the Ming Dynasty is "ever-changing, and the Tibetan characters are no more than three feet". "Three feet" was a synonym of "Fa" in ancient times, which guided the rules and standards of music. There is no doubt that Shen Zijin's statement that no one can surpass Shen Jing's "three-foot method" is the most realistic affirmation of Shen Jing's music score.
Shen Jing's "music score" is still the standard to measure the legality of legendary scripts. Playwrights and music theorists have been discussing the problem of temperament since they had this "three-foot method" for thousands of years. Wang Jide's comments on Bu in Qi Biaojia's Qulv and Wang Tingna in Yuan Shantang Qupin are mainly based on Shen Jing's Qupu. Xu Fu-zuo's Qu Lun criticized Yuan Yuling's The Story of the West Building: "I don't know what the phonological palace merchants are." It is also based on this "three-foot method". He also said with deep feelings that Shen Jing's Complete Music of Nanqu and the Degree of Knowing Music: "Set right and wrong for the world to follow, shovel away the vulgarity and let the composer know what he wants. Linz of Jiao Ran refers to South Locomotive, and we will follow it, but we will not lose the ear of the team. "