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We study $O({\ensuremath{\alpha}}_{s}{v}^{2})$ corrections to decays of $^{1}S_{0}$ heavy quarkonium into light hadrons and two photons within the framework of nonrelativistic QCD and find these $O({\ensuremath{\alpha}}_{s}{v}^{2})$ corrections to have significant contributions especially for the decay into light hadrons. With these new results, experimental measurements of the hadronic width and the …