Take the ox cart as an example.

"Cows and horses hiss", ox carts have existed since ancient times. Because cows are strong and slow, people use ox carts to pull things. Because the carriage of ox cart is very wide, it is also called cart. Before the Qin dynasty, nobles mostly took carriages and rarely took ox carts. This ethos still existed in the Qin and Han Dynasties. In the early years of the Western Han Dynasty, due to the long-term war, the economy was depressed. According to Hanshu, many civil and military officials in the DPRK rode ox carts, so it can be said that riding ox carts at this time was out of helplessness. Throughout the Western Han Dynasty and the early Eastern Han Dynasty, people always thought that riding an ox cart was a low behavior. But by the end of the Eastern Han Dynasty, the atmosphere had changed greatly, and rich nobles and bureaucrats no longer regarded riding an ox cart as a shameful thing. "Book of Jin" records: "See you later is a little expensive (ox cart). Since the (Eastern Han Dynasty) spirit and dedication, the son of heaven has always taken it. " The period written in Peacock Flying Southeast (Jian 'an Period) is the time when the Eastern Han Dynasty offered the emperor, so the word "ox and horse" in "Cow and horse hissing in the future" cannot be understood as the compound word "horse". The satrap married his son, and the carriage and ox cart were used for different purposes.