Alternatively, {HEAD ~ the atomizer} comprises two channels respectively comprising a fluid emitting nozzle and {TAIL ~ a treatment emitting nozzle} 
Alternatively , { HEAD ~ the atomizer } comprises two channels respectively comprising a fluid emitting nozzle and { TAIL ~ a treatment emitting nozzle }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL