标签：Yields 相关文章
Agriculture Report - The Limits to Organic Farming in Feeding the World This is the VOA Special English Agriculture Report. Organic farming avoids the use of chemical pesticides and manmade fertilizers. Supporters say organic farming is better for th
2012年VOA慢速英语(五)月
By Robert Raffaele Washington 29 April 2008 For the first time, scientists have used gene therapy to dramatically improve sight in people with a rare, inherited form ofblindness. Researchers in Philadelphia and London are calling the results a milest
VOA常速英语2008年（四月）
Agriculture Report - The Limits to Organic Farming in Feeding the World This is the VOA Special English Agriculture Report. Organic farming avoids the use of chemical pesticides and manmade fertilizers. Supporters say organic farming is better for th
2012年VOA慢速英语(六)月
By Brian Padden Washington 07 April 2008 Failed states are countries plagued by conflict, corruption, poverty and a lack of basic security. Advocates for international intervention say security is necessary in order for weak states to be stabilized,
VOA常速英语2008年（四月）
By Jessica Berman Washington 12 October 2006 Researchers have developed a new tuberculosis test that makes a diagnosis possible in a fraction of the time it can take using other methods. Experts say the test would be especially useful in the develop
2006年VOA标准英语（十月）