The role of environment on the star formation history of disc galaxies
  NGC\,2403, NGC\,300 and M33 are three nearby pure-disc galaxies with similar
stellar mass in different environments, they are benchmarks for understanding
late-type spiral galaxies in different environments. The chemical evolution and
growth of their discs are investigated by using the simple chemical evolution
model, in which their discs are assumed to originate and grow through the
accretion of the primordial gas, and the gas outflow process is also taken into
account. Through comparative study of the best-fitting model predicted star
formation histories for them, we hope to derive a picture of the local
environment on the evolution and star formation histories of galaxies and
whether or not the isolated galaxies follow similar evolution history. Our
results show that these three galaxies accumulated more than 50 percent of
their stellar mass at $z\,<\,1$. It can be also found that the metallicity
gradients in isolated spiral galaxies NGC\,2403 and NGC\,300 are similar and
obviously steeper than that in M33, when the metallicity gradients are
expressed in ${\rm dex}\,R_{\rm 25}^{-1}$. The similar metallicity gradients in
NGC\,2403 and NGC\,300 indicate that they may experience similar chemical
evolutionary histories. The principal epoch of star formation on the discs of
NGC\,2403 and NGC\,300 is earlier than that on the disc of M33, and the mean
age of stellar populations along the discs of both NGC\,2403 and NGC\,300 is
older than that of M33. Our results indicates that the evolution and star
formation history of a galaxy indeed depends on its local environment, at least
for galaxies with stellar mass of $10^{9.2}\,\rm M_{\odot}\sim10^{9.7}\,\rm
M_{\odot}$.
