n.动力；促进；势头；声势 双语释义：n.(名词)[S]推动,促进,刺激 thing that encourages a progress or develop more quickly[U]推动力 force with which sth moves英英释义： impetus[ 'impitəs ]n.a force that moves something along同义词：driftimpulsionthe act of applying force suddenly同义词：impulseimpul