| 释义 |
RR
US
RR (TRAIN)
written abbreviation forrailroadUS铁路，铁道（railroad的缩写）
SMART Vocabulary: related words and phrases
Railways & railway lines
aerial tram
aerial tramway
Amtrak
artery
branch line
electrify
funicular
junction
level crossing
metro
railroad
siding
signal
signal box
sleeper
switch
track
underground
unelectrified
whistle-stop
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）
SMART Vocabulary: related words and phrases
Communications - the postal system
addy
BFPO
care ofidiom
catch the post
collection box
consignee
delivery
direct mail
dispatch
first class
Freepost
pigeonhole
postage
poste restante
postmark
self-addressed
sorting office
stamp
window
zip code
You can also find related words, phrases, and synonyms in the topics:
Roads & routes in general
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）
SMART Vocabulary: related words and phrases
Animal physiology: breathing & stopping breathing
aerobic
asphyxia
asphyxiation
aspirate
aspiration
breathable
breathe (something) in
choke
draw breathphrase
expire
huff and puffidiom
hyperventilation
lungful
non-breathing
out of breath
pant
puffed
puffed out
stifle
strangulation
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