Rino里诺RIabbr.折光指数（=refractive index）abbr.罗得岛（=Rhode Island）abbr.无线电惯性制导航系统(=Radio-Inertial Guidance System)Riemann operator黎曼算子Rivinus rs ducts舌下腺小管rising diphthong上升二合元音Riemann manifold黎曼流形Rinvinus's notch反求工程rill development细沟发育Rivinus incisure里维努斯切迹, 鼓切迹Riichi Yokomitsu横光利一Riemann solution黎曼解ries of the mind见异思迁