  This paper focuses on the structure of classical sonic-supersonic solutions
near sonic curves for the two-dimensional full Euler equations in gas dynamics.
In order to deal with the parabolic degeneracy near the sonic curve, a novel
set of dependent and independent variables are introduced to transform the
Euler equations into a new system of governing equations which displays a clear
regularity-singularity structure. With the help of technical characteristic
decompositions, the existence of a local smooth solution for the new system is
first established in a weighted metric space by using the iteration method and
then expressed in terms of the original physical variables. This is the first
time to construct a classical sonic-supersonic solution near a sonic curve for
the full Euler equations.
