[化] 叔丁氧基

This is Scientific American's 60-Second Science. I am Adam Hamterture, got a minute? What's sixteen feet tall and 9,550 years old? Its the world's oldest tree. The worn and weathered spruce grows in Sweden's windswept tundra. But, until recently, wel

发表于:2018-12-24 / 阅读(74) / 评论(0) 分类 Scientific American(五)月

86 去痛片须慎用 DATE=8-16-01 TITLE=SCIENCE REPORT - OxyContin Warning BYLINE=Jerilyn Watson (Start at 1'02

发表于:2019-01-02 / 阅读(112) / 评论(0) 分类 科技之光

By Phuong Tran Dakar 14 January 2007 Miners handle stones on a hilltop of Mbola mines in Democratic Republic of Congo (File photo) The collapse of a diamond pit mine in the Democratic Republic of Congo earlier this month, in which 15 people were repo

发表于:2019-01-06 / 阅读(119) / 评论(0) 分类 2007年VOA标准英语(一月)

1. 9/11 attack ringleader Mohamed Atta is all smiles with another hijacker on a new video reportedly Atta's last will. The Associated Press secured exclusive rights to the video from the London Sunday

发表于:2019-01-08 / 阅读(161) / 评论(0) 分类 美联社新闻一分钟2006

1. Two more Amish schoolgirls died overnight following a deadly shooting in their one-room schoolhouse in Pennsylvania Monday. That brings the total number of girls fatally injured in the incident to

发表于:2019-01-08 / 阅读(109) / 评论(0) 分类 美联社新闻一分钟2006

By Dan Robinson Capitol Hill 26 October 2006 As members of Congress campaign for the upcoming legislative election, back in the U.S. Capitol a congressional ethics committee completed the third week of an investigation that could yet have a major im

发表于:2019-01-11 / 阅读(169) / 评论(0) 分类 2006年VOA标准英语(十月)

By Dan Robinson Washington 03 October 2006 The controversy over a former Republican congressman who resigned amid revelations he sent sexually suggestive messages to male pages continues to reverberate in Washington and across the United States. Pre

发表于:2019-01-11 / 阅读(114) / 评论(0) 分类 2006年VOA标准英语(十月)

STEVE EMBER: Im Steve Ember. BARBARA KLEIN: And Im Barbara Klein with EXPLORATIONS in VOA Special English. Today we talk about a method that helps provide low-income people with the financial services they need to improve their lives. Organizations a

发表于:2019-01-11 / 阅读(170) / 评论(0) 分类 2010年VOA慢速英语(六)月

By Dan Robinson Capitol Hill 13 October 2006 Several issues are expected to be key in influencing how people vote in next month's U.S. congressional elections, from public perceptions about President Bush's handling of the war in Iraq, [and] the sta

发表于:2019-01-16 / 阅读(121) / 评论(0) 分类 2006年VOA标准英语(十月)

Beginners. Well, it's time for a new dog. For the past year, we have been a one dog family. But, you know, our dog, Rosie, is a wildly social lady. She goes crazy any time she meets another dog, a cat, a mouse, or a bird, let alone a human. But, the

发表于:2019-01-28 / 阅读(78) / 评论(0) 分类 英语博客 A cup of English

By Melinda Smith Washington 14 May 2007 Top executives of the company that makes a powerful painkiller called Oxycontin admitted this week they lied about the drug's addictive qualities in order to boost sales. As VOA's Melinda Smith reports, worldwi

发表于:2019-02-03 / 阅读(132) / 评论(0) 分类 2007年VOA标准英语(五月)

By Dan Robinson Washington 05 October 2006 Majority Republicans in the House of Representatives have moved to prevent further damage from the scandal involving a former Republican congressman, Mark Foley, who resigned amid revelations he sent sexual

发表于:2019-02-03 / 阅读(92) / 评论(0) 分类 2006年VOA标准英语(十月)

By Dan Robinson Capitol Hill 10 October 2006 The Republican Speaker of the House of Representatives has pledged to fire anyone on his staff who may have tried to cover up improper Internet contacts between a former Republican congressman, Mark Foley

发表于:2019-02-03 / 阅读(104) / 评论(0) 分类 2006年VOA标准英语(十月)

By Dan Robinson Capitol Hill 15 November 2007 The longest-serving Republican speaker of the House of Representatives gave his formal farewell to Congress on Thursday. Dennis Hastert presided over the House for nearly a decade, a period that included

发表于:2019-02-03 / 阅读(87) / 评论(0) 分类 VOA常速英语2007年(十一月)

By Dan Robinson Washington 10 December 2006 Democrats and Republicans in the House of Representatives have combined conciliatory rhetoric with criticism over legislative goals as Congress moves toward adjournment. VOA's Dan Robinson reports from Cap

发表于:2019-02-05 / 阅读(122) / 评论(0) 分类 2006年VOA标准英语(十二月)

By Dan Robinson Capitol Hill 04 October 2006 An ethics committee in the House of Representatives meets Thursday amid the continuing scandal involving a former U.S. congressman, Mark Foley, and sexually explicit e-mails he allegedly sent to congressi

发表于:2019-02-05 / 阅读(113) / 评论(0) 分类 2006年VOA标准英语(十月)

Beginners. Today, Foxy had an appointment with the vet for vaccinations and a general check-up. She is about eight months old, so she needed her second set of vaccinations. The vet also needed to see if her growth was normal and healthy. I put her in

发表于:2019-02-07 / 阅读(105) / 评论(0) 分类 英语博客 A cup of English

RIO DE JANEIRO, Jan. 25 (Xinhua) -- Former Brazil international goalkeeper Dida will miss Gremio's Copa Libertadores qualifying decider against Ecuador's Liga de Quito next Wednesday with a shoulder injury. Dida hurt his right shoulder during last We

发表于:2019-02-18 / 阅读(84) / 评论(0) 分类 英语新闻
学英语单词
abastardising
adultizing
all one needs
arsena-
avalanche stoppage
band moulding
Bayezid I
beach seine hauling machine
beryllium ammonium phosphate
bummare
butterfly spread
carburelant
carry flag
closed circuit air cooling
color axis
common converter
compactifying
complement-sensitive red blood cell
compound device
coupled-cavity TWT
creep damage
crystalline silicon
cushion stiffness
Darvon cocktails
design process
desperate
duct of ravinus
ecotype
enterprises directly under central management
flight area
flokatis
flying ferment
free electron theory
full electronic telephone exchange
fundamental tolerance unit
games period
gatten
genus dimetrodons
GM_pronouns-indefinite-body-one-thing-where
god-mother
Gotarzes
grate furnace
heterotopic thyroid
hot blast air
HT (high temperature)
iconizations
indium sesquioxide
instant occlusion
iridium tetraiodide
joint custody
land leveling machine
laughing academies
lawd
left and right
line-selector oscilloscope
linear eczema
long-range perspective
Manila gold
missionary positions
Monte Sant'Angelo
moral wrong
muitiple-die press
multilayer interconnection structure
nodular malignant melanoma
one way only operation
Order of the Bath
phlebotomus fever
photostat copy
phthisis mesenterica
pinkletink
plugin card
postpartum alopecia
primary beam
prorogues
questmongers
read counter
real situation
received data lead
redoable
reflective powers
rerubbing
road head
routine administration
sentimentalise
soil-types
special gelatin
stereophotogrammetric survey
stick force per g
stockstill
suction main
tabular mass
to make advances to sb
trypanid
under-fellow
vertical bar code
water lifts
waveguide arm
windowless image intensifier
winsome
xyloid coal
yaws