RR

劍橋詞典

RR (TRAIN)


written abbreviation for railroad noun
鐵路，鐵道（railroad的縮寫）

RR (POST)


written abbreviation for rural route : used in addresses in some areas in the US
鄉(xiāng)村郵件投遞路線（用于美國鄉(xiāng)村地區(qū)通信地址中，rural route的縮寫）

RR (BREATHING)

medical   specialized
written 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