  Comparing the expected spectroscopy in the relativistic quark model and the
predicted strong decays in the $^3P_0$ model employing the realistic wave
functions from the relativistic quark model with the measured properties of the
LHCb and BaBar charmed states, we find that the masses and strong decays of
these charmed states can be reasonably explained in the conventional $q\bar{q}$
picture, and therefore suggest that the $D(2550)$/$D_J(2580)$,
$D^*(2600)$/$D^*_J(2650)$, $D(2750)$/$D_J(2740)$, $D^*(2760)$/$D^*_J(2760)$,
$D_J(3000)$, and $D^*_J(3000)$ can be identified as the $D(2^1S_0)$,
$D(2^3S_1)$, $D^\prime_2(1D)$, $D(1^3D_3)$, $D(3^1S_0)$, and $D(1^3F_4)$,
respectively.
