Therefore, {TAIL ~ production} of {HEAD ~ the nozzle} is easy, and its production cost is low 
Therefore , { TAIL ~ production } of { HEAD ~ the nozzle } is easy , and its production cost is low
OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH