单词：vertex dioptric power
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By Jim Malone Washington 31 January 2007 As the U.S. Senate prepares to debate President Bush's decision to send more troops to Iraq, it also serves as a reminder of the historical tensions that have existed between the president and Congress during
2007年VOA标准英语（一月）
Former U.S. President Clinton and mayors from around the world are gathering in Seoul this week for a summit on reducing greenhouse gases in the world's cities. London Mayor Boris Johnson says the leaders hope to agree on ways to end the world's end
VOA标准英语2009年(五月)
By Mil Arcega Washington, DC 06 September 2006 watch report Green Business Many companies are learning they can be both pro-business and pro-environment without hurting the bottom line. In fact, for some, it's been quite profitable. ----- Being envi
2006年VOA标准英语（九月）
图 graph 子图 subgraph 有向图 digraph(directed graph) 无向图 undigraph(undirected graph) 完全图 complete graph 连通图 connected graph 非连通图 unconnected graph 强连通图 strongly
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At age 89, Mary Fasano graduated with a bachelor s degree from the Extension School last week and entered the history books as the oldest person to earn an undergraduate degree at Harvard. Following is the speech she delivered -- The Power of Knowled
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Egypt's military rulers have agreed to form a new government and promise to transfer power to a civilian body by July. Politicians say the agreement was made during a crisis meeting on Tuesday as tens of thousands of Egyptians protested in the street
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