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<正>Let G=SU(2.2).K=S(U(2)×U(2)),and for l∈Z.let{τ_l}_(leZ) be a one- dimensional K-type and let E_l be the line bundle over G/K associated toτ_l .It is shown thal theτ_l-spher cal function on G is given by the hypergeometric functions of severa