单词：ethanoic acid (acetic acid)
单词：ethanoic acid (acetic acid) 相关文章
By Paula Wolfson White House 30 April 2007 The latest United States-European Union summit has ended with signs of progress on several issues that have strained trans-Atlantic ties, including alternative energy and pushing ahead on world trade talks.
2007年VOA标准英语（四月）
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高翔BECV中级培训
Yakima is a small city located an hour and a half's drive(1) from Wenatchee. It is a wide valley, famous for its grapes and apples. We were there last weekend for a baseball tournament, the first of the season(2). One interesting fact about Yakima is
英语博客 A cup of English
THIS IS AMERICA - White Sands National Monument: A Wonder of Nature, in New Mexico By Shelley Gollust Broadcast: Monday, September 19, 2005 (MUSIC) ANNOUNCER: Welcome to THIS IS AMERICA IN VOA Special
This is America
The US economy continues to recover from the tech bubble burst of 2000. But there're certainly many people still left behind. Long-term unemployment which is defined as being out of work for 27 weeks is at record levels. And within that group,the per
2005年NPR美国国家公共电台
An estimated 20 percent of the population has trouble working with numbers. That's as many as one person in five with some sort of numerical disability. The British researchers are exploring ways to stimulate the brain to improve the ability to under
VOA标准英语2010年(十一)月