rap

n.轻敲 vt.轻敲

random signal, randomize, randomly, randomness, randy, ranee (also rani), rang, range, range-finder, ranger, rani, rank, ranking officer, rankle, rankly, rankness, ransack, ransom, rant, ranter, rapacious, rapaciously, rapacity, rape, rapid, rapid transit, rapid-fire, rapidity, rapidly, rapids, rapier, rapier-thrust, rapine, rapist, rapport, rapprochement, rapscallion, rapt, raptly, rapture,