The word 进入 is formed through a classic Chinese method of compounding, where two independent characters with very similar meanings are combined to create a single, more precise or formal concept. The first character, 进 (jìn), carries the core meaning of "to advance" or "to move forward", while the second, 入 (rù), means "to enter" or "to go into". By pairing these two synonyms, the word creates a reinforced, holistic sense of "to enter into", emphasizing the action of moving forward and crossing a boundary to go inside or join a new state, rather than simply approaching it.