(underground 的现在分词) n. 地下, 地铁, 地道, 秘密活动
a. 地下的, 秘密的
adv. 在地下, 秘密地
(undergrounding 的复数)

学英语单词
absolute extremum optimizer
account-payee
altitude sensor
anemovane
anodont
antacidin
antti
archaeopyle
Arctogaean
automatic parallax detection
barred winding
be in with someone
benzoin brown
capillary aneurysm
cattle shed
cerodontha (icteromyza) nigricoxa
chabli
Changp'ung-gun
cryptoanarchy
daslandian disturbance
dinic
do you accept American dollars
duplex printing
dynamo brush
enlarged period
Escuaero's tests
establisht
farmboys
general price level changes
God bless me !
grace of God
group edit
guestfriendships
heating resistance mat
herauds
home stick relay control circuit
horizontal tilt
Hydroxymeionite
hyperpyrexias
iminoes
isolated adaptive routing
Kenyonville
keycode
keyed agc
Kirkwood, Mt.
Koelreuteria bipinnata
Land of Blest
less-than-satisfactory
ligamentum vocal
Little Ruaha
lonchura punctulata topela
malgovernance
masekela
miscellaneous goods
neutralists
nibbling machine
nicandrenone
nigger-driver
old line states
peace negotiations
peak flow
pleurohepatitis
polar wind divide
polymolecule
port tug
potassium platinate
potato spindle tuber
procedural instruction
pseudo tensor
rail grinding car
rainsquall
rat floods
refuse matter
Secretary of the Navy
seenie
self first
Semen Entadae
shear-steel
shipping tag
siberian millets
smuggish
space gauge
ST_arriving-and-departing_movement-through-the-air
suboptimisation
supergens
supering
tar-acids
task switch
terrestrial magnetic field
test crew
thermal piercing
Thioplex
thrombocythaemias
trichromatic colours
ureterocyst
value barter trade
valve rocker arm short spring
ventricular gallop rhythm
walfordite
weiqi
weld strain
zikurat