  The remaining uncertainties of isovector nuclear interactions call for
reliable experimental measurements of isovector probes in finite nuclei. Based
on the Bayesian analysis, although the neutron-skin thickness data or the
isovector giant dipole resonance data in $^{208}$Pb can constrain only one
isovector interaction parameter, correlations between other parameters are
built. Using combined data of both the neutron-skin thickness and the isovector
giant dipole resonance helps to constrain significantly all isovector
interaction parameters, thus serves as a useful way in the future analysis.
