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We studied the σ-meson production both in N+N, N+d, etc., collisions and also in J/ψ, ψ(2S), ψ(3S), Υ(1S), etc., two-pion decays. The fundamental distinctions between the basic σ-meson parameters found in various types of processes can be explained most naturally by the chiral symmetry restoration in intermediate excited hadronic resonances. In the present talk we discuss various aspects of chiral symmetry restoration in hadronic processes with interrelation to the basic features of QCD.