Beverage is like a belt, describing a critical situation, like a belt that is about to break.

Source: "Historical Records·Biography of Yuan Anchaocuo": "When Fang Lu was Empress, all the Lus were good at ministering to the king. The Liu family was like a leader."

Nothing Rufa describes the situation as critical, like a hair that is about to break.

Source: "Book of Han·The Biography of Yan Ci King Liu Dan": "In the past, the Lus conspired to rebel, and the Liu family was like a hair."

The original work of "Bujue" is "Bujue" If the line". ① Describe a critical situation, like a line that is about to be broken. ②Describes the decline of descendants or the scarcity of successors.

Source: "The Biography of Gongyang: The Fourth Year of Duke Xi": "The Southern Yi and the Northern Di are in contact, and China is like a line."