(For example, all students have taken the train. When taking the train, they have encountered their own train that was apparently stopped, but the trains on the surrounding tracks are moving backward. They will have an illusion that their train is moving forward. The map principle of flying shooting games is exactly the same as this one. The player is controlling the position of the plane flying on the screen, and the background image always rolls back, giving the player the illusion that the plane under his control is flying forward. As shown in the figure below, two map images replace the roll on the back of the screen, which will give the player the illusion of moving forward.)
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