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Since the coupling strengths of strong force,weak force and electromagnetic force meet at the scale of 10^16 GeV,then why weak force and electromagnetic force are unified at the scale of 10^2 GeV? We may see the two coupling strengths' curves are not intersect at this scale... And further,why unification scale of GUT force and gravity (10^19 GeV) is not equal to GUT scale(10^16 GeV)?