RR
劍橋詞典
RR (TRAIN)
written abbreviation for railroad noun
鉄路，鉄道（railroad的縮寫）
RR (POST)
written abbreviation for rural route : used in addresses in some areas in the US
鄕村郵件投遞路線（用於美國鄕村地區(qū)通信地址中，rural route的縮寫）
RR (BREATHING)
medical specializedwritten abbreviation for respiratory rate (= the rate at which someone breathes in and out)
呼吸頻率（respiratory rate的縮寫） 返回 RR