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English definition of “RR”

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RR

US

RR (TRAIN)

written abbreviation for railroad noun

RR (POST)

written abbreviation for rural route: used in addresses in some areas in the US

RR (breathing)

specialized medical written abbreviation for respiratory rate (= the rate at which someone breathes in and out)
Translations of “RR”
in Chinese (Traditional) 火車, 鐵路,鐵道…
in Chinese (Simplified) 火车, 铁路,铁道…
(Definition of RR from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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