Obviously, {TAIL ~ the introduction} of lubricant provides the added advantage of carrying heat from the knife and cooling the knife , thereby enabling {HEAD ~ still higher speed operation} 
Obviously , { TAIL ~ the introduction } of lubricant provides the added advantage of carrying heat from the knife and cooling the knife , thereby enabling { HEAD ~ still higher speed operation }
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD