准抛物形反射器

By Jill Moss Broadcast: July 28, 2003 This is Bill White with the VOA Special English Development Report. Millions of people around the world cook their food over a smoky fire every day. It is often d

发表于:2018-11-27 / 阅读(903) / 评论(0) 分类 VOA2003(下)-发展与科学

by Jason Marshall Weve now talked about three methods for calculating average values: the mean, median, and mode (affectionately known as the three Ms). So, are we done? Is that everything we could ever want to know about interpreting average values?

发表于:2018-12-07 / 阅读(114) / 评论(0) 分类 数学英语

In 1970, the Soviet Union put a laser reflector on the moon, carried by a rover. A few months later, it disappeared. Some speculated that the rover had fallen into a crater or parked in such a way as to render the reflector inaccessible. Now after 40

发表于:2018-12-24 / 阅读(91) / 评论(0) 分类 Scientific American(四)月

据《科学》杂志报道,苏联的月球车40年前在月球表面留下了激光反射器,虽然经过多年的搜寻科学家始终没有发现激光反射器的踪迹。 4月22日,一组物理学家终于发现了来自反射器的微弱闪

发表于:2019-01-02 / 阅读(126) / 评论(0) 分类 60秒科学

Gain - This is an increase in signal power, due to a boost from an electronic device. Garbage - These are unwanted characters that appear because of either incorrect settings or noise. Gate - These ar

发表于:2019-01-03 / 阅读(104) / 评论(0) 分类 电信英语

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? The 2011 Nobel Prize in chemistry goes to Daniel Schechtman of the TechnionIsrael Institute of Technology in Haifa. Schechtman discovered what are called quasicrystals.

发表于:2019-01-08 / 阅读(142) / 评论(0) 分类 Scientific American(十)月

This is the VOA Special English Development Report. Millions of people around the world cook their food over a smoky fire every day. It is often difficult to find wood for the fire. People who do not have wood must spend large amounts of money on co

发表于:2019-01-11 / 阅读(91) / 评论(0) 分类 VOA慢速英语2008年(九)月

By Greg Flakus Albuquerque, New Mexico 25 July 2007 Large scale collection of solar power arrays As the world searches for ways to produce energy without burning fossil fuel, there is increased interest in solar energy. One place associated with sola

发表于:2019-01-12 / 阅读(129) / 评论(0) 分类 2007年VOA标准英语(七月)

DEVELOPMENT REPORT – May 13, 2002: Solar Cookers By Jill Moss This is the VOA Special English Development Report. Millions of people around the world cook their food over a smoky fire every day. It

发表于:2019-01-14 / 阅读(98) / 评论(0) 分类 农业与发展

The Five-hundred-meter wide Aperture Spherical Telescope, or FAST, is now operational in the mountains of Guizhou in southwest China. FAST has been designed to help Chinese researchers better understand our universe, as well as probe the cosmos for e

发表于:2019-01-19 / 阅读(117) / 评论(0) 分类 2016CRI中国国际广播电台

Bart's upstairs neighbor was driving him nuts. He made all kinds of strange noises at all kinds of strange hours. If I tell my neighbor he's noisy, he won't believe me, Bart thought. He'll believe me only if he lives downstairs and hears himself upst

发表于:2019-01-22 / 阅读(82) / 评论(0) 分类 英文短篇故事(纽约)

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(117) / 评论(0) 分类 VOA常速英语2007年(十一月)

The construction of the project was started in 2011 with an investment of 1.2-billion yuan, or about 180 million US dollars. The 500 metre Aperture Spherical Telescope, or FAST, is the size of 30 football fields. It's located in a hollow that was for

发表于:2019-02-21 / 阅读(124) / 评论(0) 分类 2016CRI中国国际广播电台
学英语单词
a bad risk
A/D
aachen (aquae grani)
abnormal weight
acroconidia
amphibious
angle Jacquart's
aphis pomis
Arsuaga
banking technique
Bardis
bay felling
bisay
bobby-pin
bocconia frutescenss
cable driven car
clausthalers
cold plastic
compiling system
corrosive liquid disinfectants
demountable device
detachable anchor shack
eclipsing X-ray star
eerisome
Einstein equation
EPFM (elasto-plastic fracture mechanics)
epiphase
exfoliative dermatitis of newborn
falcatad
family Ramphastidae
file model
fixed electrode method
gelsemidine
go deep into a subject
groove pass
hunting deck
hyperthrombinemia
infinitely variable speed
jugate
kadomzev
Kefaloka
Kozłowo
lead a cat-and-dog life
leave with pay
lecanorate
list broker
locum tenenss
lubricating oil family
make a concession
Martes americana
minimetropolis
misrelates
MUPL
nathaniel hawthornes
net net weight
oil-extended rubber
olive-drabs
one-ofs
oscillating plasma
oyste
parallel set
pectocellulosic
peripheral device controller
Pilea linearifolia
polygonal screen
polyvinyl fomate resin
predisposings
production station
program table
Pucciniastrum formosanum
radar scatterometry
red gurnard
refrigerating fluid
relieved load
Rhizophyllidaceae
round middle file
scleromere
scophthalmus rhombuss
SEDAS
seize up
sidecar wheel
smash the yoke of imperialism
stable
static fuel consumption
subpelviperitoneal
superancy
support bar
Tedzhen (Harī Rūd)
telescope-axle mirror
telluroxide
ten times easier
The Virgin
Tisamid
twin cathode
ultraviolet spectroscopy
uniform crime reports
utero-
Vaalie
Valencian
Vaudin
vause
WiFi repeater