-R
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RR
rear
Rh
Rhodium
R.R.
railroad;(=Right Reverend)可尊敬的…;(=rural road)乡村道路
R.H.
(=relative humidity)相对湿度;右手的;右方的;right-handed;(=Royal Highlanders) …
W.R.
(=West Riding)西赖丁;(=war reserve)战时后备队