  We present the results of on-the-fly mapping observations of 44 fields
containing 107 SCUBA-2 cores in the emission lines of molecules, N$_2$H$^+$,
HC$_3$N, and CCS at 82$-$94 GHz using the Nobeyama 45-m telescope. This study
aimed at investigating the physical properties of cores that show high
deuterium fractions and might be close to the onset of star formation. We found
that the distributions of the N$_2$H$^+$ and HC$_3$N line emissions are
approximately similar to that of 850-$\mu$m dust continuum emission, whereas
the CCS line emission is often undetected or is distributed in a clumpy
structure surrounding the peak position of the 850-$\mu$m dust continuum
emission. Occasionally (12%), we observe the CCS emission which is an
early-type gas tracer toward the young stellar object, probably due to local
high excitation. Evolution toward star formation does not immediately affect
nonthermal velocity dispersion.
