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