音标:[ekeɪ'siːziəm] ;
n. 准铯(钫)

[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(152) / 评论(0) 分类 美国英语听力80篇

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(143) / 评论(0) 分类 Scientific American(八)月

By Saqib ul-Islam Washington 12 October 2009 Amreeka's stars, pictured on the movie's promotional poster What is it like for a mother and her teenage son to settle in America? And what if they are Palestinian and their arrival coincides with the ons

发表于:2019-02-20 / 阅读(210) / 评论(0) 分类 VOA标准英语2009年(十月)
学英语单词
airwell
alkyl sulfonamide
Alor Gajah
anonymous server
axial heater
Barbonin
be watching the clock
beast of burden
beglad
blowsier
capturings
carotid body
chan'go
cholelithotrity
chronic renal failure
cocktion
concentration polarization
constant flow
Cromovan
dag.
darac
dimecron
Dürrenstein
electric tape cloth
electrode regulation
film threading
fiorano
front angle
GaAsP
Gallo Mountains
Grut
gyro effect
high LET radiation
Hortlax
Hydrotachylite
idle time
increating
Internet personality
jutai
Kawa I.
kirkenes
lacquers paint
ligamenta
liquor potassii acetatis
locomotive position transducer
Lovenox
lustier
macphhenicol
macroseismograph
main valve head cap screw
mercury azide
misgreeting
misick
multiple-phase fluid flow
myelinic neuroma
Napoleon complex
navigational warning broadcast by radio telex service
nontax
obsessive idea
otsoes
overexposed hologram
paper advance
penicillium brefeldianum
Plutella maculipennis
poplar (populus)
population potential
pre-text
priority of assignment
pulverulence
put down one's name
read around check
regurgitation-feeding
resilient nystagmus
rompishness
rudder motor
Ruppiaceae
SeaCat
secondary solvent
setting speed
spring a surprise on sb
staff members' regulations
state judicial organs
steam-heat
strainer core gate
system flow
textile machines
Thersites
thurlbecks
took their place
transportation network
travelling apron
trioctylamine(TOA)
tunnel burner
TV licence
unibus
unomitted
vanadium hydromica (roscoelite)
verified methodology
vertically integrated utility
videl telephone
why should i
work-place