Adler function from $R^{e^{+}e^{-}}(s)$ measurements: experiments vs QCD theory

The QCD analysis of the experimental motivated behaviour of theAdler D-function in the Eucledian region is described. It is stressed that taking into account the $b$-quark mass-dependent $\alpha_s^2$-effects one can get better agreement of the theoretical predictions with the experimentally motivated behaviour of the D-function at high enough momentum transfered. The more detailed analysis of the considered QCD predictions, which include the information on quark and gluon condensates parameters, can be done after getting more precisie $e^+e^-\to {hadrons}$ data at the energy regions $E<M_{J/\Psi}$ and $M_{J/\Psi}<E