RR

剑桥词典

RR (TRAIN)


written abbreviation for railroad noun
铁路，铁道（railroad的缩写）

RR (POST)


written abbreviation for rural route : used in addresses in some areas in the US
乡村邮件投递路线（用于美国乡村地区通信地址中，rural route的缩写）

RR (BREATHING)

medical   specialized
written abbreviation for respiratory rate (= the rate at which someone breathes in and out)
呼吸频率（respiratory rate的缩写） 返回 RR