地磁极

By Parke Brewer The women's pole vault provided one of the stirring dramas of the 2004 Olympic track and field competition. Until the mid 1990s, women's pole vault was not taken very seriously, mainly

发表于:2018-12-12 / 阅读(84) / 评论(0) 分类 VOA2004(下)--雅典奥运

Larry Newitt from the Geological Survey of Canada charts the movement of the magnetic North Pole as it wanders the icy reaches of northern Canada. To determine where the magnetic pole / is, we can't rely on one single observation. What I try to do is

发表于:2019-01-22 / 阅读(81) / 评论(0) 分类 自然百科2011年

图片1 图片2 图片3

发表于:2019-02-09 / 阅读(172) / 评论(0) 分类 加州语文教材California Treasures G5

By calculating how old the rocks are where we find these ancient compasses, we can figure out how long ago the magnetized parts were locked in. That tells us which direction was magnetic north tens of thousands of years ago. Surprisingly, its not alw

发表于:2019-02-23 / 阅读(102) / 评论(0) 分类 英语时差8,16

Magnetic North Pole Moving Faster Than Scientists Expected Earths north magnetic pole is moving, researchers say. It has moved so much, so quickly that a group of scientists hurried to change a model that helps guide shipping, airplanes and submarine

发表于:2019-03-12 / 阅读(263) / 评论(0) 分类 2019年VOA慢速英语(二)月
学英语单词
acetoarsenite
acute angled triangle
ancillula
balconet
boil-water
brachidial support
Bukit Cina
calm your farm
capillary force
capitol pk.
carbon-dates
chilihead
Chinsu-ri
Churuguara
clubiona taiwanica
cock crow
cologno monzese
commissar
conditionally sigma-complete
contingent duty
cross pack
dentros
disgenius
dun dealgan (dundalk)
Ekiatap
electrical-resistance thermometer
electrode acceleration
electronic energy spectrum
end-to-side intestinal anastomosis
engineering solution
factor in
First Nations
Fortran
free living nitrogen fixation
Fuselloviridae
get out countenance
get sth up
giffen paradox
glass gage
glovin'
half-adder binary
hexothiocaine
hodograph circle
Houben-Hoesch synthesis
hunger edema
hurry-up wagon
hydraulic press-packing
lecanora pallida
leisure-time
lithotripsy
llenan
lubricating oil strainer element
makambako (makumbako)
metasedimentary rock
micro-moles
modification kit
mummichog
Narragansett Bay
non-melodic
obninsk
operation of relay
Ormosia pingbianensis
oxydiethylene
pailly
parametric upconverter
peat bog
permutite
phone connector
phosphor amplifier
prowersite
pulmonary eosinophilosis
radar dome
residual porosity
reverse circulation gravel pack
ringdown circuit
scale-model investigation
schmeissers
setting down
shrimpa
simple cycle
Spasskaya Guba
stegging
strain gauge torque measuring instrument
Sturluson
subeconomic forest
synchronous data-link control
take a life
taoistest
telemetry data center
tenement-house
thermology
thick-split graft
thread take-up lever link hinge pin
topoangulator
transplutonics
umbilical gap(in gastropodods)
underwithholds
univalent antibody
urban soil and water conservation
utility powerboattrailer
waiver of privilege
white space count program