  We study two-body D -> PP decays, assuming that each decay process go through
the bare amplitude followed by elastic SU(3) rescattering, where the bare
amplitude consists of (i) the color-allowed and color-suppressed factorization
amplitudes and (ii) the short-distance weak annihilation amplitudes. We have
performed the \chi^2 fit on 14 branching ratios of D -> PP decays in the
formalism of the above mentioned model. The final state interactions can be
well accounted for by the short-distance annihilation topologies and SU(3)
rescatterings. The two SU(3) rescattering phase differences are \delta \equiv
\delta_{27}-\delta_{8} \simeq -46^\circ and \sigma \equiv
\delta_{27}-\delta_{1} \simeq -21^\circ, where \delta_{27}, \delta_{8} and
\delta_{1}are the rescattering phases of final states corresponding to the
representations 27, 8 and 1, respectively. We find that the D^0 -> K^0
\bar{K}^0 decay occurs mainly due to the nonzero short-distance weak
annihilation effects, originating from SU(3) symmetry-breaking corrections to
the distribution amplitudes of the final-state kaons, but receives tiny effects
from other modes via SU(3) rescattering. Our results are in remarkable
accordance with the current data.
