radar

n.雷达

racialist, racially, racily, raciness, racing, racism, racist, rack, rack-railway (also esp US cog-railway), rack-rent, racket, racket (also racquet), racket-press, racketeer, racketeering, rackety, raconteur, racoon, racy, RADA, radar trap (also speed trap), radial, radially, radiance, radiant, radiantly, radiate, radiation, radiation sickness, radiator, radical, radicalism, radically, radicle, radii, radio, radio astronomer, radio astronomy, radio car, radio cab, radio frequency,