单词:superheat fuel assembly cluster
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By Gary Garriott Broadcast: August 11, 2003 This is Bill White with the VOA Special English Development Report. 1)Sawdust is what remains after trees and logs are cut up into boards for building house
Nowadays, most of the food we eat is cooked in ovens or on stoves. The heat which is needed to cook this food comes from burning wood, gas, or other fuels1. However, natural resources2 are decreasing. When fuel becomes less available, people have to
Cluster balloonists tie a bunch of helium balloons to a lawn chair, sit in the chair, cut the anchor rope, and go flying into the wild blue yonder. To land, they cut some of the cords attaching the balloons to the chair. A small group of daredevils h
This is Scientific Americans 60-Second Science. Im Steve Mirsky. Got a minute? To keep your car purring, you have to change the oil. Such maintenance produces eight billion gallons of used motor oil annually. Some waste oil does get re-refined to pro
DEVELOPMENT REPORT - Double-Drum Sawdust Stove By Gary Garriott Broadcast: Monday, September 27, 2004 This is Steve Ember with the VOA Special English Development Report. Sawdust is what remains after
By Lisa Schlein Geneva 12 November 2006 A Cluster Bomb Unit, dropped by Israeli warplanes, sits in southern village of Ouazaiyeh, Lebanon, November 9, 2006 A new international treaty aimed at reducing the deaths and injuries from cluster bombs, land
By Tony Budny Washington 27 March 2008 An upstart car company in the United States is seeking to take advantage of rising oil prices. Aptera has produced a three-wheeled vehicle that can reach speeds of 136 kilometers per hour and operate on little g
The U.N. Secretary-General says between $25 billion and $40 billion is needed each year to boost agricultural production and assist farmers worldwide, in order to curb the growing global food crisis. From United Nation's headquarters in New York, VO
Hundreds of Thousands of Cluster Munitions Destroyed A new report says governments that joined the treaty banning cluster munitions have destroyed nearly 750-thousand of the weapons since 2008. However, it also says there are credible allegations of
NASA Identifies Shuttle Endeavour's Heater Glitch NASA says engineers at Kennedy Space Center believe they have identified the cause of the heater failure that forced the postponement of the launch of the shuttle Endeavour. NASA technicians say the f
This is a glimpse of what the future may look like. The goal is to have a very affordable, very economical to operate, but still a very dependable vehicle, said Ron Cerven, who built one of the cars with his Li-ion Motors team. It is one of a 136 veh
VOA Finds Evidence of Syrian Cluster Bomb Use In Azaz, Syria, in late January, Syrian government forces used what arms experts say is a particularly deadly weapon. Residents say a plane dropped nine large cluster bombs on this neighborhood on the out
Cluster Munitions Have Prolonged Impact Mohamed is 13 years old. Two years ago, he played with a shiny metal object he found outside his home in Benghazi, Libya. He didn't know it was a cluster munition until it exploded. Cluster munitions release sm
65 航天飞机的飞行准备 DATE=7-4-01 TITLE=EXPLORATIONS #1959 - Preparing Shuttle for Space Flight BYLINE=Paul Thompson VOICE ONE: This is Shirley Griffith. VOICE TWO: And this is Steve Ember wi
By Lisa Schlein Geneva 16 May 2007 In a just released report Wednesday, Handicap International says hundreds of millions of people worldwide face a daily risk of death or maiming by cluster bombs. Lisa Schlein has more for VOA from Geneva, where the
Oxygen therapy can bring drug-free relief to many Vidushi Sinha | Washington, DC 15 December 2009 A new study shows that breathing pure oxygen can considerably lessen the agony experienced with severe headaches Cluster headaches are described by suff
Hydrogen and Industries Hydrogen,the lightest and simplest of the elements, has several properties that make it valuable for many industries. It releases more heat per unit of weight than any other fuel.In rocket engines, tons of hydrogen and oxygen
Voice 1 Welcome to Spotlight. I'm Ruby Jones. Voice 2 And I'm Ryan Geertsma. Spotlight uses a special English method of broadcasting. It is easier for people to understand, no matter where in the world they live. Voice 1 Soraj Ghulam Habib is a young
Instead of burning coal, oil, or biomass to heat things up, scientists have found that its possible to use solar energy. For example, some experimental facilities use thousands of mirrors to reflect sunlight onto a large plate on a tower, heating it
What Is Fire? 火是物质燃烧过程中散发出光和热的现象,是能量释放的一种方式。火焰分为焰心、中焰和外焰,温度由内向外依次增高。燃烧过程必须有可燃物、燃点温度、氧化剂三项并存,缺一