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Please explain this statement: The parabolic diffusion model is mainly used to describe that the release of urea is controlled by the outer surface/edge diffusion.

Please explain this statement: "The parabolic diffusion model is mainly used to describe that the release of urea is controlled by the outer surface/edge diffusion". what is the outer surface/edge diffusion? how can the parabolic diffusion model describe the outer surface/edge diffusion? please give example when you explain because I really have no idea. thanks so much.

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