There are several pens in the East.

"Dong" is a Chinese character (commonly used word), which is a first-class general specification of Chinese. This word first appeared in Oracle Bone Inscriptions in Shang Dynasty. The ancient glyph of "East" is like a pocket, and both ends are tied with ropes, which is the initial character of "East". The common meaning of the east is the direction in which the sun rises, and the extension points to the east. During the Spring and Autumn Period, when Zheng was jointly besieged in the East, Zheng sent messengers to lobby not to unite with Jin to destroy Zheng, so Zheng could be the host of Qin's mission to the East, so it was used as "host" or "host", generally referring to the host of guests.

"East" is borrowed to indicate orientation, which refers to the position where the sun rises. For example, it is recorded in Shangshu Gong Yu: "As for Huayin in the south, it is at the bottom (pillar) of the east." The word "East" here is a locative word, as opposed to "West". "East" is where the sun rises. The ancients had a richer understanding of the opposite position than modern people, and "East" and "West" often became the standard to define the opposite, which would be involved in both mountains and rivers and personnel. For example, "Shandong" and "Shanxi" have different boundaries in different dynasties, such as Huashan and Taihang Mountain, as well as "Jiangdong" and "Jiangxi". In terms of residence, the owner lives in the house to the east of the principal room and the guest lives in the house to the west of the principal room, so the owner is called "East" and the guest is called "West", so there are such names as "owner", "landlord" and "shareholder". "Zuo Zhuan Xi Gong Thirty Years" contains: During the Spring and Autumn Period, Qin Jin United to surround Zheng, and Zheng Wen sent Candlewood out of the city to lobby Qin Mugong to withdraw. After stating clearly the interests of destroying Zheng to the State of Qin, Candlewood said that if Zheng was not destroyed, he would "entertain" the envoys of the State of Qin, and Zheng would provide houses and food, which would not cause any harm to the State of Qin. In the east of Qin State, Zheng State received the envoys of Qin State to the East, so it was called "the host" (the master on the East Road). Later generations used "host" to refer to the host who invited guests, or simply used "host" or "east", such as "I'll be the host at noon today".