na. 背对背
[网络] 背靠背;背对背拥抱;背至背

学英语单词
a-watch
acceleration wave
all metal structure
bedevilment
bernard malamuds
bipolar compatible JFET
bosserts
breland
bubble inclinometer
cargo hold dihumidification system
chimicas
clan armed fighting
closed-cell stratocumulus
CO2 safety relief system
colchicaceaes
computer architectures
coral thrombus
crueltie
decoherer
decoronate
delivery pipe line
discretionary interest
dry cleans
dry rale
dual-beam oscilloscope
dunavska ravnina
dysmenorrhea
echinulatus
echoeier
egginton
electric bell flat push button
electrochemical constant
electromagnetic radiation reflector
electropneumatic switch circuit controller
epithelialise
extramammary Paget disease
facultative denitrification
fish noise direction finder
florilegiums
forced-choice format
genus Bruchus
go to Davy Davy's locker
green-bluest
handle extension
Harrington Harb.
hatmoney
health physics assistant
heat radiation pyrometer
Hellespontic
heronimus
horned screamers
hot-cracking test
inconcussed
induction air
isoimmune haemolytic anaemia
isotope shift of molecular spectrum
kelf
libocedrus decurrenss
lisomucol
Lyudkovo
marine gravity meter
Merowe
mimic diagram
minor sector
mixed aniline point
multimeltas
navigation signal equipment
necturus maculatus
neutrodyne circuit
night biters
nocturnlabe
non-concentrated
normal starting sequence
ombrotiphic
Orlice Mountains
panning chain
paraben
petrophone
pot-houses
punch set
radar controlled departure
RDVR
sawlter
sidereous
sir thomas wyats
six-years-old
snubbed
special information operations
standard instrument departure
Strobilanthes affinis
tax revenue source
Telegraphic Quarantine
Thesprotia
time-ordered product
traditional ceramics
trinitas
tubular collector
unacked time
unmantling
vertical plane coupler
weighter
xenia puerto-galerae