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Theory of low-frequency zonal structure(LFZS)generation as one mechanism for Alfvéneigenmode(AE)nonlinear saturation is presented,including 1)spontaneous excitation of LFZS by beta-induced AE(BAE)via modulational instability,and 2)effects of energetic particles(EPs)on zonal flow(ZF)generation by Toroidal AE(TAE).