"Bus" can be said to be the predecessor of the bus. The royal bus first appeared, of course, only for juren who came to Beijing to take the exam, and ordinary people were not allowed to take it.

(2) [Cars provided by an organization]: public vehicles.

(3) [Name of official offices in Han Dynasty]: official offices in Han Dynasty.

Andy heard about Hengshan's medical skills and the characteristics of visiting doctors by bus, and then moved to my Taishiling. -"Zhang Hengchuan"

Because the Han Dynasty used buses and horses to pick up and drop off candidates, then "buses" refers to candidates who went to Beijing to take the exam. For example, 1895, after the defeat of the Sino-Japanese War of 1894-1895, Kang Youwei tried to recruit people in Beijing together with other provinces, and signed a letter, which was called "writing on the bus" [1].

(4)ACG and "private car" refer to promiscuous women, just like mobile toilets.

(5) Some people call buses "buses". Although this statement is simple, it is easily confused with other concepts. For example, a bus is the opposite of a private car, and a "bus" is a public car, not a private car, so national, collective and company cars can all be called "buses". The famous "writing on the bus" in history refers to the move of 1300 juren headed by Kang Youwei in the late Qing Dynasty to jointly write to Emperor Guangxu. The "car" here refers to the carriage sent by the court! From the Han dynasty, the royal family used public carriages to pick up and drop off those who were recruited to take the exam. Later, "bus" became synonymous with people entering and leaving the exam.