"东部" is formed through the combination of two meaningful characters: "东", which represents the concept of "east", and "部", which denotes a "part" or "section". By joining these characters, the compound word emerges to conceptually designate the eastern portion or region of a larger area, such as a country or territory. This process exemplifies how Chinese often creates terms by directly linking semantic elements to convey a clear, composite idea, where the first character specifies direction and the second character defines the division, resulting in a unified meaning that is intuitively understood from its components.