{HEAD ~ The transition process} from the standby fluid flow to {TAIL ~ the assisting fluid flow} is easily changed so that it does not make the driver feel uncomfortable and therefore supplies the assisting force effectively 
{ HEAD ~ The transition process } from the standby fluid flow to { TAIL ~ the assisting fluid flow } is easily changed so that it does not make the driver feel uncomfortable and therefore supplies the assisting force effectively
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL 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 OTH