corresponding areas are seen with low intensities in the $^{13}$CO and C$^{18}$O maps at \[47.2, 60.2\] km s$^{-1}$. One can find a very weak $^{13}$CO and C$^{18}$O emission toward W33 B in the cloud at \[29.6, 43.3\] km s$^{-1}$, while the strong molecular emission is traced toward W33 B in the cloud at \[47.2, 60.2\] km s$^{-1}$. In the direction of the filamentary structures and the W33 complex, some areas with compact $^{13}$CO and C$^{18}$O emission are also seen in map at \[44, 46.5\] km s$^{-1}$, which is an intermediate velocity range between other two clouds.

In Figure \[fig9\]a, we show a color-composite image of our selected area with the $^{13}$CO maps at \[29.6, 43.3\] and \[47.2, 60.2\] km s$^{-1}$ in red and green, respectively. The filamentary feature “fs1" observed in the [*Herschel*]{} column density map and the positions of the ATLASGAL clumps are also highlighted in Figure \[fig9\]a. Figure \[fig9\]b displays the overlay of the surface density of Class I YSOs on the color-composite image produced using the $^{13}$CO maps at \[29.6, 43.3\] and \[47.2, 60.2\] km s$^{-1}$. A majority of the Class I YSOs are found toward the common zones of the two cloud components (see areas toward 