单词：long standing problem
单词：long standing problem 相关文章
For the first time ever, the city of Dar es Salaam in Tanzania has hosted a Chinese Film Week. Many locals were treated to popular Chinese movies, and to make sure nothing got lost in translation -- some of the movies had English subtitles while othe
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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute. If you want to shell a walnut, it helps to have a nutcracker. And if you want to digest seaweed, it helps to have the right enzymes. Now, a study in the jo
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Health Report - Designing an Alternative to Antibiotics This is the VOA Special English Health Report. In nineteen twenty-eight a British scientist made a chance observation. He noticed that some mold had grown in bacteria in a culture plate in his l
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By Jessica Berman Washington 24 December 2006 A new study by the World Health Organization has found drug-resistant tuberculosis in virtually all of the 79 countries the organization surveyed around the world, with particularly high levels in countr
2006年VOA标准英语（十二月）
By Jessica Berman Washington 04 October 2006 New research suggests that infectious diseases may run in families. Investigators say the discovery represents a major shift in the way scientists view human disease. Experts have always accepted that cer
2006年VOA标准英语（十月）
By David McAlary Washington 07 June 2006 Children collect water in Luanda, Angola Researchers in Bangladesh have tested a drug that cures cholera in most patients, showing that it is a useful new weap
2006年VOA标准英语（六月）