单词:vacuum melting method
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By Gary Garriott Broadcast: September 1, 2003 This is Sarah Long with the VOA Special English Development Report. People have always had to find ways to keep food safe to eat. Methods to dry, smoke an
She inspected the carpet for small items. She saw a paper clip and a rubber band. She picked them up. She put them into a little box on the kitchen counter. She plugged in the vacuum cleaner. She turned on the switch. The cat ran out of the room. She
DEVELOPMENT REPORT – Canning Food By Gary Garriott Broadcast: Monday, January 03, 2005 I'm Gwen Outen with the VOA Special English Development Report. People have always had to find ways to keep foo
Each year, millions of people visit the 4,570-meter-high Baishui Glacier in southern China. Scientists say it is one of the worlds fastest-melting glaciers. The huge body of ice is in the southeastern edge of a Central Asian region called the Third P
This is Scientific American 60-Second Science. I'm Cynthia Graber. This will just take a minute. The fridge is one of your home's biggest energy hogs. Better insulation can make refrigerators much more efficient. And a panel encasing a vacuum is one
By Paul Sisco Washington, DC 24 May 2006 watch Melting Poles report NASA scientists, working with 10 years of satellite data, find a dramatic thinning of ice around the edges of Greenland, and Antarctica too. satellite view of earth Using satellite