According to the inquiry of 360 Chinese studies, the word comes from "Biography of Wang Han Mang": "The provinces are shocked and the soldiers are in Shu Lang." After the Southern Dynasties, Liang Yuanang used "vigor" to describe the vigor of calligraphy. Today, "tense" means "tense", which means that the situation is tense and explosive. Crossbow (nǔ):) An ancient bow that used mechanical force to shoot arrows.