Temporal variations in SFR and the gas mass in the ring regions at ﹩R\lt {R}_{\mathrm{ring}}+0.2\,\mathrm{kpc}﹩ (top), the bar regions at ﹩{R}_{\mathrm{ring}}+0.2\,\mathrm{kpc}\lt R\lt {R}_{b}+0.5\,\mathrm{kpc}﹩ (middle), and the arm regions at ﹩R\gt {R}_{b}+0.5\,\mathrm{kpc}﹩ (bottom). The left and right panels are for the cold- and warm-disk models, respectively.