The word 读书 is formed by directly combining two meaningful characters: 读 (dú), which means "to read", and 书 (shū), which means "book". It is not an abstract construction but a concrete, almost pictorial pairing where the first character denotes the action and the second character denotes the primary object of that action. Together, they create a simple, compound concept that visually and logically represents the core activity of "reading a book", from which broader meanings like "to study" are naturally derived.