riffn.即兴重复段；反复乐节Riffel steel钨工具钢riff-raffs不三不四的人riffled tube输送粘油的内螺丝管,焙烤管riffle board去轻馏分用的容器,缓冲器riffled iron网纹铁板riffle shoal急流滩riffled sheet网纹钢板riffle beetle浅滩甲虫riffled table淘洗台riffled plate花纹钢板