互切不变式；相切不变式

VOA标准英语2009年-Al-Shabab Militants Divided over Tacti

A rising dispute between militants in Somalia may have split the country's al-Qaida-linked al-Shabab group into two factions. Reports say the suicide bombing at a Mogadishu hotel earlier this month deepened divisions between an al-Shabab leader close

发表于:2019-01-07 / 阅读(119) / 评论(0)

VOA标准英语2009年(十二月)

VOA慢速英语2010年-IN THE NEWS - For 33 Rescued Miners in

This is IN THE NEWS in VOA Special English. (SOUND) Rescue workers at the San Jose gold and copper mine in northern Chile had reason to sing this week. A small hole drilled into the earth became a passage to freedom for thirty-three trapped miners. T

发表于:2019-01-12 / 阅读(98) / 评论(0)

2010年VOA慢速英语(十)月

VOA标准英语2011--Natural Spectacle Blooms in Texas

Spring has just sprung in the Northern Hemisphere, and that means an annual natural spectacular is just a couple of weeks away, deep in the heart of Texas. There are no other natural wonders in the rugged Texas Hill Country. No awe-inspiring canyons,

发表于:2019-01-14 / 阅读(115) / 评论(0)

VOA标准英语2011年(三月)

2006年VOA标准英语-Women's Health an Obstacle to Reducing Poverty

By Jordan Davis Dakar 17 October 2006 Nomad woman stand in a food line at a village near the small town of Dakoro, Niger As the international community marks World Poverty Day Tuesday, health experts say one of the keys to reducing poverty is improv

发表于:2019-02-01 / 阅读(149) / 评论(0)

2006年VOA标准英语（十月）

2007年VOA标准英语-Scientists Face Obstacles in Vaccine Developmen

By Ernest Leong Washington 19 March 2007 watch Vaccine report Some U.S. state lawmakers are fighting a mandate requiring certain vaccinations for children, saying it encourages undesirable behavior. Getting vaccinated has become a more complicated pr

发表于:2019-02-07 / 阅读(115) / 评论(0)

2007年VOA标准英语（三月）

VOA标准英语2009-UN Prosecutors Seek to Limit Taylor's Contac

By Scott Stearns Dakar 11 November 2009 Liberian President Charles Taylor in court (file photo) U.N. prosecutors at the war crimes trial of former Liberian president Charles Taylor want to limit his access to defense lawyers during cross-examination

发表于:2019-02-12 / 阅读(151) / 评论(0)

VOA标准英语2009年(十一月)

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adiathermance

advanced cabin entertainment and service system (acess)