单词：water vapour arc welding
单词：water vapour arc welding 相关文章
This is the VOA Special English Development Report. A few degrees can make a big difference when it comes to food storage. Foods can go bad if they get too warm. But for many of the world's poor, finding a good way to keep food cool is difficult. Re
VOA慢速英语2007年（十一）月
Flood survivors blocking a highway in southern Sindh province in Pakistan outrage they're not seeing the humanitarian aid promised them. The BBC's Mike Wooldridge says an estimated 20 million people are affected with waterborne diseases on the rise.
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When astronaut Alan Shepard took his first swing at a golf ball on the moon, he hit more dirt than ball. The dust he kicked up reinforced the idea that the moon is one big sand trap. But looks can be deceiving. Now, scientists reanalyzing lunar sampl
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This is the VOA Special English Development Report. A few degrees can make a big difference when it comes to food storage. Foods can go bad if they get too warm. But for many of the world's poor, finding a good way to keep food cool is difficult. Re
VOA慢速英语2009年（二）月
SCIENCE IN THE NEWS - How Cooling the Brain May Help People Sleep FAITH LAPIDUS: This is SCIENCE IN THE NEWS, in VOA Special English. Im Faith Lapidus. BOB DOUGHTY: And Im Bob Doughty. Today, we tell how cooling the brain may help people who have tro
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