  Using data samples collected with the BESIII detector at the BEPCII collider
at center-of-mass energies ranging from 3.80 to 4.95 GeV, corresponding to an
integrated luminosity of 20 fb$^{-1}$, a measurement of Born cross sections for
the $e^+e^-\to D^{0}\bar{D}^{0}$ and $D^{+}D^{-}$ processes is presented with
unprecedented precision. By performing a simultaneous fit to the dressed cross
sections for both processes, one possible new structure around 3.9 GeV/$c^2$ is
observed for the first time, in addition to seven known resonances
$\psi(3770)$, $\psi(4040)$, $\psi(4160)$, $Y(4230)$, $Y(4360)$, $\psi(4415)$,
and $Y(4660)$. These results offer crucial experimental insights into the
nature of hadron production in the open charm region.
