written abbreviation forrailroad noun 铁路,铁道(railroad的缩写)
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)
specialized medical written abbreviation for respiratory rate (= the rate at which someone breathes in and out)呼吸频率(respiratory rate的缩写)
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