R字開頭的單詞或詞組
raw materialsraptureriderrationready-to-wearryereputablerelieve sb of sthrebuiltregularityrumourreproductionrelentRCTrebukeresinroodrecitationreliabilityrespirationresign torolledregulusr.p.m.repositoryrungradialrecyclingruptureratingruinsringingrealizationreliancereference numberrake inresurrectrustyrenegaderow overrun-onradar