The word 进来 is formed by combining two directional characters that together map a complete path of motion: 进 (jìn), meaning "to enter" or "to go in", establishes the primary action of moving inward across a boundary, while 来 (lái), meaning "to come" or "toward the speaker", provides the perspective or endpoint of that movement, indicating the direction is toward the observer's location. Thus, the compound visually and conceptually fuses the idea of crossing into a space with the trajectory of arriving toward a specific point, creating a single, fluid concept of "to come in".