The modification of the Paschos-Wolfenstein relation is investigated when the
charge symmetry violations of valence and sea quark distributions in the
nucleon are taken into account. We also study qualitatively the impact of
charge symmetry violation (CSV) effect on the extraction of
sin2θw from deep inelastic neutrino- and antineutrino-nuclei
scattering within the light-cone meson-baryon fluctuation model. We find that
the effect of CSV is too small to give a sizable contribution to the NuTeV
result with various choices of mass difference inputs, which is consistence
with the prediction that the strange-antistrange asymmetry can account for
largely the NuTeV deviation in this model. It is noticeable that the effect of
CSV might contribute to the NuTeV deviation when the larger difference between
the internal momentum scales, αp of the proton and αn of
the neutron, is considered.Comment: 15 Latex pages, no figure, final version to appear in PR