钕激光辐射

By Carol Pearson Washington 30 April 2008 Ten years ago, the U.S. Food and Drug Administration approved LASIK, eye surgery with a laser that enables people to see without glasses. But about five percent of LASIK procedures fail, and those patients ca

发表于:2018-12-08 / 阅读(147) / 评论(0) 分类 VOA常速英语2008年(四月)

Doctors use X-rays to view internal organs, obtain clear images of possible disease and to treat cancer. For years radiation has been used to save lives, but there is growing concern that some patients are getting more than they ask for when they und

发表于:2018-12-08 / 阅读(146) / 评论(0) 分类 VOA标准英语2010年(一月)

EXPLORATIONS - The History of the Laser Welcome to EXPLORATIONS in VOA Special English. Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one of the best examples of how technology can

发表于:2018-12-16 / 阅读(131) / 评论(0) 分类 2013年VOA慢速英语(二)月

New Laser Device Helps Parkinson's Patients Walk 新激光设备帮助帕金森患者重获行走能力 Parkinsons disease slowly destroys the brains ability to control the muscles, depriving the patients of their mobility. Researchers at the Mayo Cl

发表于:2018-12-16 / 阅读(116) / 评论(0) 分类 VOA标准英语2014年(二月)

But I needed something else. I needed something to go that extra mile, and I found it in that metaphor which I had learned from my mother when I was four. 但是我需要另外一些东西,我需要增加我的旅程,我在意象中找到了它,那

发表于:2018-12-19 / 阅读(146) / 评论(0) 分类 TED演讲教育篇

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Animals rely on all sorts of cues to find their next meal. Monkeys and birds are attracted to the colors of ripe fruits and berries. And snakes find thei

发表于:2018-12-24 / 阅读(146) / 评论(0) 分类 Scientific American(十)月

Sometimes it is hard to see the light, especially it lies in the invisible spectrum, like ultrared, ultraviolet radiation. But if you long to see the unseeable, you might interested to hear that under certain conditions people can catch a glimpse of

发表于:2018-12-24 / 阅读(139) / 评论(0) 分类 2015年Scientific American(一)月

The United States Navy has demonstrated a new laser weapon operating in the Persian Gulf. The Laser Weapons System, or LaWS, is deployed on the USS Ponce transport ship. A live test firing of the weapon was recently carried out for Cable News Network

发表于:2019-01-02 / 阅读(146) / 评论(0) 分类 2017年VOA慢速英语(七)月

Human exploration of Mars is now an official goal of the National Aeronautics and Space Administration (NASA). Last month, U.S. President Donald Trump signed a bill to increase NASAs budget. The law sets spending at $19.5 billion for the 12-month per

发表于:2019-01-02 / 阅读(132) / 评论(0) 分类 2017年VOA慢速英语(四)月

This is All Things Considered. I'm Michelle Norris. Phone calls from Sweden woke up two American scientists this morning, John Hall and Roy Glauber. They will share the Nobel Prize for Physics with a German Researcher Theodor Haensch. All three worke

发表于:2019-01-08 / 阅读(218) / 评论(0) 分类 2005年NPR美国国家公共电台

U.S. health experts monitoring Japan's nuclear crisis are seeking to explain health risks from radiation(放射) exposure, while cautioning that radiation levels measured this week at the Fukushima-Daiichi power plant in northern Japan have not y

发表于:2019-01-11 / 阅读(164) / 评论(0) 分类 英语新闻

DOUG JOHNSON: This is SCIENCE IN THE NEWS, in VOA Special English. I'm Doug Johnson. FAITH LAPIDUS: And I'm Faith Lapidus. Today, we will tell about skin cancer. (MUSIC) DOUG JOHNSON: Skin cancer is one of the most common forms of cancer. It is also

发表于:2019-01-11 / 阅读(248) / 评论(0) 分类 2010年VOA慢速英语(七)月

The History of the Laser Welcome to EXPLORATIONS in VOA Special English. Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one of the best examples of how technology can go from the sci

发表于:2019-01-12 / 阅读(202) / 评论(0) 分类 2013年VOA慢速英语(五)月

EXPLORATIONS - The Laser: Futuristic Science Found at Your Local Store MARIO RITTER: Welcome to EXPLORATIONS in VOA Special English.Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one

发表于:2019-01-12 / 阅读(170) / 评论(0) 分类 2012年VOA慢速英语(一)月

By Paul Sisco Washington 14 November 2007 At the McDonald Observatory in western Texas, a unique space program has been quietly underway for more than 30 years. It is called the Lunar Laser Ranging Program. VOA's Paul Sisco has more. Research scienti

发表于:2019-01-31 / 阅读(173) / 评论(0) 分类 VOA常速英语2007年(十一月)

The World Health Organization (WHO) warns against the indiscriminate(任意的无差别的) use of potassium iodide as a precaution against nuclear radiation. WHO is issuing this advisory following reports of people in Japan and elsewhere who are usi

发表于:2019-02-06 / 阅读(296) / 评论(0) 分类 英语新闻

A key Japanese adviser on radiation(放射 ) leaks at the country's disabled Fukushima nuclear power facility has quit in protest over the government's handling of the disaster. The adviser, Toshiso Kosako, a radiation safety expert at the Univer

发表于:2019-02-06 / 阅读(157) / 评论(0) 分类 英语新闻

NEW DELHI, March 16 (Xinhua) -- The Indian government has ordered food originating from(发源于) Japan to be tested for radiation in the wake of explosions at a Japanese nuclear plant following a devastating earthquake-tsunami last Friday, repo

发表于:2019-02-07 / 阅读(143) / 评论(0) 分类 英语新闻

Public opinion polls suggest most Americans favor full body scanners as a way to protect against terror attacks on commercial airliners. The benefits of scanners are being debated in a number of countries. Some groups have raised privacy issues. But

发表于:2019-02-07 / 阅读(129) / 评论(0) 分类 VOA标准英语2010年(一月)

WASHINGTON, March 30 (Xinhua) -- A trace amount of radioactive(辐射性的) iodine(碘) has been found in a sample of milk from the west state of Washington, the U.S. Environmental Protection Agency and the Food and Drug Administration (FDA) sai

发表于:2019-02-11 / 阅读(156) / 评论(0) 分类 英语新闻
学英语单词
a graduate student
accelerating pump cover
added value of industrial output
All power belongs to the people.
Almen machine
amplitude modulated signal
antifungal preparation
atamestane
auxiliary kiln drive
bar-code scanner
betraynted
Bināwās
blackcap raspberry
blinkest
bubble memory device
butt hole
capsule of Chinese caterpillar fungus
combustion curve
come upon
crack critical velocity
crank shaft pick
cranney
crash maneuverability
data power
ditch mud
Document of Vessel
dynamic microspeaker
electrochemical methods
eugene poplar
featurelessnesses
fire integrity
forward definition chain
Fourier Lenses
funnel temperature
Galapagos sea lion
hard launch
hardbakke
Hasa
head hand stand
Hoblyn
imagevision
interactive multimedia systems
international standardization
jus naturae
knob-slob
least square filter restoration
ledger for track maintenance
lepiota rhacodess
Lichtenborn
linaceae flax family
lvdd
mangangranate (spessartite)
market practice
master pendulum
mobile grain drier
multi-orbit
multiprocessing environment
myrinpodotoxismus
neutral burning curve
nightwatchman
nomen ambiguum
non - human primates
Non-system disk error or disk error
nuclear quadruple resonance(NQR)
Nuku'alofa
ototome
outdriving
pantry man
Pars cartilaginosa
patholotical diagnosis
periodonticss
point symmetry element
pseudosclerema
pterygopolymorphism
regenerative feed system
reparanda
rhizoma chuanxiong
Rhododendron denudatum
Road-material
running crowning fire
samb
self support
semilog diagram
sewing machine for fur
sharptail molas
shoogle
Sisyrinchium
spark range
sphincterotome
squirrelish
strontium maleate
Tallangatta
test verification
threshold control speed
through and through suture
tungsten arc inert gas weld
turkish dance and music
typewriter jockey
wearabilities
whey butter
wusbands
zhlubby