透镜的中性焦强

Our story today is called The Diamond Lens. It was written by Fitz-James O'Brien. We will tell the story in two parts. Now, here is Maurice Joyce with part one of The Diamond Lens. When I was ten years old, one of my older cousins gave me a microscop

发表于:2018-12-08 / 阅读(559) / 评论(0) 分类 2018年VOA慢速英语(二)月

Poverty Source of Tropical Infections in Texas, Gulf of Mexico Chagas is an infectious disease transmitted by the kissing bug. The kissing bug looks a little bit like a cockroach but it has the ability to feed on blood and it lives in the very poor q

发表于:2018-12-08 / 阅读(129) / 评论(0) 分类 VOA标准英语2012年(三月)

AMERICAN STORIES - Short Story: The Diamond Lens by Fitz-James O'Brien (Part 2) Now, the Special English program, AMERICAN STORIES. (MUSIC) Our story is called The Diamond Lens. It was written by Fitz-James O'Brien. Today we will hear the second and

发表于:2018-12-16 / 阅读(140) / 评论(0) 分类 2011年VOA慢速英语(六)月

中和抗体有望助力艾滋病疫苗研制 Researchers say powerful antibodies may hold clues to developing an effective AIDS vaccine.The antibodies were isolated from individuals already infected with HIV. Dr. Wayne Koff saysthe goal is to find a

发表于:2018-12-16 / 阅读(116) / 评论(0) 分类 VOA标准英语2016年(七月)

During his first term in office, Indonesian President Susilo Bambang Yudhoyono oversaw a period of robust economic growth based on exports. This year exports have slowed as a result of the global recession. As the president gets set to begin his seco

发表于:2018-12-19 / 阅读(153) / 评论(0) 分类 VOA双语新闻 2009年9月

Our story is called The Diamond Lens. It was written by Fitz-James O'Brien. Today we will hear the second and final part of the story. Here is Maurice Joyce with part two of The Diamond Lens. When I was a child, someone gave me a microscope. I spent

发表于:2019-01-03 / 阅读(392) / 评论(0) 分类 2018年VOA慢速英语(三)月

This is Scientific Americans 60-Second Science. Im Cynthia Graber. Thisll just take a minute. Heres a strange tale of two previously unrelated food products. First: chitlins, that delicacy of fried pig large intestines. Theyre well-loved throughout t

发表于:2019-01-08 / 阅读(149) / 评论(0) 分类 Scientific American(十一)月

Flu Virus Disarms Immune System's First Responders 流感病毒瓦解免疫系统的第一道防线 From VOA Learning English, this is the Health Report. 这里是美国之音慢速英语健康报道。 Infection by the influenza virus may be more co

发表于:2019-01-12 / 阅读(184) / 评论(0) 分类 2013年VOA慢速英语(十二)月

AMERICAN STORIES - Short Story: The Diamond Lens, Part 1, by Fitz-James O'Brien SHIRLEY GRIFFITH: Now, the Special English program, AMERICAN STORIES. (MUSIC) Our story today is called The Diamond Lens. It was written by Fitz-James O'Brien. We will te

发表于:2019-01-12 / 阅读(160) / 评论(0) 分类 2011年VOA慢速英语(六)月

AS IT IS 2015-03-05 UK Group Brings Eyeglasses to Rwanda 英国组织向卢旺达提供眼镜 Most people in developed countries do not have a problem getting prescription eyeglasses. They go to an ophthalmologist -- a trained specialist who treats p

发表于:2019-01-12 / 阅读(122) / 评论(0) 分类 2015年VOA慢速英语(三)月

Scientists Gather for AIDS Vaccine 2011 The largest conference on AIDS vaccine development is being held in Bangkok, Thailand FROM September 12th to the 15th. Researchers will discuss how to build on recent advances in a time of tight budgets. Organi

发表于:2019-01-13 / 阅读(122) / 评论(0) 分类 VOA标准英语2011年(九月)

New Yellow Fever Vaccine Shows Promise A new vaccine for yellow fever is showing good results in tests as it overcomes one of the biggest problems with the current version. Yellow fever is a deadly disease that occurs in much of South America and sub

发表于:2019-01-14 / 阅读(151) / 评论(0) 分类 VOA标准英语2011年(四月)

Potent Antibodies Offer New AIDS Vaccine Design Researchers say powerful antibodies may hold clues to developing an effective AIDS vaccine. The antibodies were isolated from individuals already infected with HIV. Dr. Wayne Koff says the goal is to fi

发表于:2019-01-14 / 阅读(141) / 评论(0) 分类 VOA标准英语2011年(八月)

UK Scientists Develop Cheap Adjustable Glasses 英国科学家开发廉价可调眼镜 Ninety-five percent of people in Sub-Saharan Africa who need glasses don't own a pair, according to the Britain-based charity foundation Vision for a Nation. Its f

发表于:2019-01-14 / 阅读(154) / 评论(0) 分类 VOA标准英语2015年(一月)

美国准备销毁叙利亚化学武器 The U.S. Defense Department is preparing to test a system it plans to use to destroy Syria's chemical weapons stockpiles at sea. Officials are offering reassurances that the process will be safe. 美国国防部正

发表于:2019-01-18 / 阅读(152) / 评论(0) 分类 VOA双语新闻 2013年12月

During his first term in office, Indonesian President Susilo Bambang Yudhoyono oversaw a period of robust economic growth based on exports. This year exports have slowed as a result of the global recession. As the president gets set to begin his sec

发表于:2019-01-31 / 阅读(127) / 评论(0) 分类 VOA标准英语2009年(九月)

You know I don't need you You know I don't need your hell If you going give me something Well give me something I can't give myself Oh, don't want your money Don't want your rolodex of friends Already have me a daddy Take a new picture for your portr

发表于:2019-02-09 / 阅读(242) / 评论(0) 分类 音乐咖啡厅

Israel has issued a stern warning after Iran said it had begun making a higher-grade nuclear fuel. Israeli Prime Minister Benjamin Netanyahu says Iran's intentions are clear. Iran is racing forward to produce nuclear weapons in brazen defiance of the

发表于:2019-02-12 / 阅读(147) / 评论(0) 分类 VOA标准英语2010年(二月)

Meanwhile the tireless Rutherford, now back at Cambridge as J. J. Thomson's successor as head of the Cavendish Laboratory, came up with a model that explained why the nuclei didn't blow up. He saw that they must be offset by some type of neutralizing

发表于:2019-02-17 / 阅读(148) / 评论(0) 分类 万物简史

When a virus enters your body, your body has to recognize it then produce a protein called an antibody. These antibodies attached to the virus and neutralize it. However, in the time it takes your body to produce enough antibodies, the virus may have

发表于:2019-02-23 / 阅读(118) / 评论(0) 分类 英语时差8,16
学英语单词
11-cisretinal
Abrasax stones
accessory structure
advanced data communications control protocol
Ambalangoda
asphalt prepared roofing
back-dating
backflushing technique
bank controller
berke
bidigitatus
biotch
bright emitter
cancinogenic substance
Capps Glacier
clairaudiently
colubraria fautomei
continuous duty with short-time
couplehood
CubeSat
cumulated amount
current tangible assets
daads
dactylognathite
dentsu
detonation limits (in air )
double-strength pipe
electronic auto-leveling device
envenomating
financial-planning
fixed assets expenditure
free-falling classifier
freight or carriage paid to
FTP servers
high frequency vibrating screen
hostile-environment machine
humeral veil
ice-breakings
imitation chambray
inchcolms
japanners brown
Khmer architecture
Kotaagung
lichenase
lick one's boots
linseys
liquid petrolatum quality test
low band
lung-bud
Lüllau
manual valve
marine distress signals
Maso di Banco
material fund
mean time between maintenance
memorialise
meshuggeners
microhooks
Monona County
multipurpose use of waste gas
musharraf
Naeser process
Namhaeansanjulgi
NPV profile
on special offer
original bedding
outer guiding post
pipe line jetty
pipeline program
porphyrellus fusisporus
potassium guaiacolsulfonate
potassium tetrasilicate
radio inertial guidance system
rammings
reachable vertex
refractive index profile measurement
remote subscriber
salt-loaded
sexualising
show levels
sound bite
spa-goers
stake someone to something
standard coordinate system
startle effect
stichocyte
support capacity
survey on damage to cargo
sutpen
synthetic metal
ten-hut
thixotropic propellant
trachypodopsis crispatula (hook.)fleisch
Trigo de Morais
underfloor raceway
Vargas, Estado
Vulcanalia
witch's hat
withcalled
X-ray optical system
xiphium iriss
zero address format