音标:[,prəʊtæk'tɪnɪəm] ;
n. [化学] 镤(元素符号Pa,等于protoactinium)

学英语单词
abundant rainfall
acylamidase
ampeliscid
anniversary of one's birth
ask over
asymmetric line
awkward squad
back-off power
ball-and-socket hinge device
Bani, Jbel
belt grinding-lapping machine
Bhanpura
by the same token
can see
changes in the quantity demanded
channel program translation
charring temperature
Chatroulette
chylomicras
cilliers
closed-throat with tunnel
computer-bound system
conoidal shell
cool-er
crisis theory
cryo-resecter
cycloidal motion
dehumanize,dehumanising
device of wear compensation
dioceses
dioscorea batatas decne f. tsukune mak.
drop oscillation feed
dust-cooled reactor
dwarfing stock
electron-bombarded amorphous silicon
esomycin
exempt person
expression of higher degree
farm field
feminacentrism
fifi hook
firm platform
flamenol
flood control sluice
Fraunhofer diffraction and spectral analysis
geometrical optics limit
green mountain states
groscolas
heptahydrates
high-yield drilling clay
hooding end hood
hopper monitor
inditing
Krasner
langsdorfii
last sector
let loose the dogs of war
lisners
lubricating-method
manganophyllite
microargininosuccinic aciduria
monark
multi-purpose hall
necking in operation
negative-sequence direction component
normal capacitance
notched tensile strength
open hearth practice
over the river and through the woods
pipas pipas
process production
qualified accountants
quarter light
radiator stay rod pin
recomposed rock
relay selsyn
renouveau
resumption of residence
rhizidiomyces apophysatus zopf
ROMET
round-body packing ring
scenaria
seating load
seismic action
sound-ranging base
spiral bevel gear with circular arc tooth profile
spotted minute
stew in your own juice
sub-levels
sunfall
system timing table
territorializable
text-to-speech convert
towage contract
tsotsi
turbid phlegm obstructing lung
unpulleyed
vacuum electron beam welding
variable condenser
weaker sex
westheimer
what's what