At the same time, {HEAD ~ the injector} is arranged to deliver fuel to the incoming air in a manner which promotes mixing of {TAIL ~ the air} and fuel for combustion 
At the same time , { HEAD ~ the injector } is arranged to deliver fuel to the incoming air in a manner which promotes mixing of { TAIL ~ the air } and fuel for combustion
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH