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Gravity code: ring shape, pure black, no pattern or lines. Using the gravity code requires solar energy. It is bound to the user by inputting the voiceprint and pupil print, and the user uses the voiceprint and pupil print to activate the gravity code. The gravity code only recognizes the user's brain signals. Ten billion magnetic field particles are stored internally in the gravity code. Magnetic field particles: spherical. Consumption of solar energy. It can release the magnetic field and destroy the gravitational force between particles, that is, decompose and reconstruct it. User: Need to memorize the gravitational and repulsive relationships between particles. Different gravitational and repulsive relationships correspond to different codes. The gravity code recognizes the user's brain signal, receives the code, and inputs it into the magnetic field particles. This technology is like a divine power, and can humans use the gravity code to find a world without terrifying dragons...