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<正> In this paper,we introduce a new invariant set _0={u:u_x=f'(x)F(u)+ε[g'(x)-f'(x)g(x)]F(u)×exp(-i∫~u 1/F(z) dz)},where f and g are some smooth functions of x,ε is a constant,and F is a smooth function to bedetermined.The invarian