Furthermore, with such a construction, {HEAD ~ the air injection modules} have an advantage in {TAIL ~ view} of maintenance 
Furthermore , with such a construction , { HEAD ~ the air injection modules } have an advantage in { TAIL ~ view } of maintenance
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH