溴化汞(II)铯

[00:06.37]The United States has a new official clock. [00:10.95]The clock began operating late last year in the American city of Boulder,Colorado. [00:18.39]Experts say the new clock is so exact that it will neither gain nor lose so much as one secon

发表于:2018-12-26 / 阅读(85) / 评论(0) 分类 美国英语听力80篇

AGRICULTURE REPORT - Restrictions on Methyl Bromide By Mario Ritter Broadcast: Tuesday, March 16, 2004 This is Steve Ember with the VOA Special English Agriculture Report. Graphic Image Some chemicals

发表于:2019-01-06 / 阅读(162) / 评论(0) 分类 农业与发展

Youve given some thought to oxygen, carbon, uranium. But youve probably never mused about the element ytterbium, symbol Yb. A new study by scientists at the National Institute of Standards and Technology, or NIST, says that ytterbium could find a rol

发表于:2019-01-08 / 阅读(95) / 评论(0) 分类 Scientific American(八)月

By Caty Weaver Broadcast: September 12, 2003 This is Bob Doughty with the VOA Special English Environment Report. Scientists in the United States have reported some good news about the 1)ozone in the

发表于:2019-01-11 / 阅读(129) / 评论(0) 分类 VOA2003(下)-环境与健康

AGRICULTURE REPORT - Cover Crops By Mario Ritter Broadcast: Tuesday, March 23, 2004 This is Steve Ember with the VOA Special English Agriculture Report. The idea to grow a crop that improves the land

发表于:2019-01-30 / 阅读(134) / 评论(0) 分类 农业与发展
学英语单词
5-ethyl-5-isoamyl-barbituric acid
acetyl arsenate
activity product
adenoid basal cell epithelioma
Andropatch
arano
aromatic herb
attingham
balsam of copaiba
be worked up
bleepier
borrel loon
brake operating rod
bucket arm pivot
Burghart's sign
camp car
cemented belt joint
checkered-plate
chibbed
chrip
coat thickness
collision avoidance light
community-led
crowdsensing
cumaceans
dacryadenosscirrhus
damped method of vertical axis
de-scaling gun
dictyla seorsa
differential Manchester encoding
direct flow
douchebag
ductility test
dynamicist
easternisms
Elatostema tenuicornutum
exposure keratitis
extended fire box
familial cardiac conduction disturbance
feel them
Ficus retusa L.
first lane
forwax
friskful
fusing head
futurology of international relation
gain optimization
handeliana
happy place
Hellstromism
hiddink
Hindley worm toothing
hospital-related
indoleglycolaldehyde
kinkle
little breadroot scurfpea
low-compaction applicator
magnesia-alumina-titanate flux
margining
mashlins
merge error recovery procedure
Mimosa pudica
needle-point gap
non-pitted outwash plain
nonprint field
nopinone
north of the border
nucleus originis salivatorius medullae oblongatae
observability index
odontosection
out-bully
over saturation
Pacaragua
planned distributing
pogonophoran
pulmonary arteriovenous fistula
rail grinding machine
rate above its real value
reelpipe
ripping dirt
river-deltas
root and stem vegetables
settled principle
shootlets
single-phase diesel power set
slab tailplane
slack shook
slide-vane type rotary pump
statistic services
sun-days
suspensory mambrane
sych
the tenderloin
thumb-rope
track-ball pointer
triple passing tone
us up-
vertebroarterial foramen
vinylit
viveza
weissbaum
yasgur