This is Scientific Americana 60 Seconds Science, I'm Christopher Intagliata, got a minute.The Sahara desert isn't known for its greenery, but there's evidence it was once much lusher than today, dotted with waterfall and lakes, now a study suggests t

发表于:2018-12-24 / 阅读(47) / 评论(0) 分类 Scientific American(九)月

The city of Tenness was consumed by the desert in the sandstorm of the last of the holy year. Wiped clean by ? Indiana Jones' friend, ?, explaining the fictional fate of the City of Tenness in Raiders of the lost Ark. Back in real life scientists hav

发表于:2018-12-24 / 阅读(54) / 评论(0) 分类 2015年Scientific American(十一)月

VI. Furthering Listening and Speaking Task 1: Dust Storms American researchers say dust clouds from dry African deserts may be a threat to human health in the United States. The dust may contain many small organisms that could be dangerous. Each year

发表于:2018-12-29 / 阅读(132) / 评论(0) 分类 新视野大学英语:视听说教程 1

By Chris Simkins Washington, D.C. 29 March 2006 watch Training report The U.S. Defense Department continues an ambitious military counter-terrorism program in nine nations across poor and largely Musl

发表于:2019-01-09 / 阅读(123) / 评论(0) 分类 2006年VOA标准英语(三月)

Climate Change Blamed for Dying African Trees A lot of trees are dying in Africas Sahel region and new study says climate change caused by humans is to blame. Whats more, many tree species are also disappearing. The study appears in the Journal of Ar

发表于:2019-01-13 / 阅读(45) / 评论(0) 分类 VOA标准英语2011年(十二月)

Africa's Sahara Desert, as seen from the International Space Station's new seven-windowed cupola Crew members of the U.S. space shuttle Endeavour opened the shutters on the International Space Station's new observation deck Wednesday, revealing a spe

发表于:2019-01-13 / 阅读(53) / 评论(0) 分类 VOA标准英语2010年(二月)

For some Africans, southern Sudan's expected independence is a cautionary tale; others see it as a pathway for their regions to gain full sovereignty. According to Bloomberg News, Somaliland's foreign minister, Mohamed Omar, says his government plans

发表于:2019-01-14 / 阅读(65) / 评论(0) 分类 VOA标准英语2011年(二月)

society, that first brought civilization to the desert. Far from just scraping by in this harsh landscape, the Garamantes were flourishing. They grew crops, such as cereals and grapes. They kept horses and pigs. Clearly, they needed large amounts of

发表于:2019-01-22 / 阅读(64) / 评论(0) 分类 自然百科2010年

So the rigid hierarchical structure of Egyptian society wasn't just dictated by the Pharaohs. It also emerged because the Egyptians had only one water source - the Nile. 5,000 years ago, it wasn't just the ancient Egyptians who noticed the value of r

发表于:2019-01-22 / 阅读(54) / 评论(0) 分类 自然百科2010年

It takes about two months to cross the Sahara Desert by camel from top to bottom, 骑骆驼从撒哈拉沙漠北边到南边,大约需要两个月的时间。 and there is no other way to go than by camel or airplaneno railroads, no auto roads, no

发表于:2019-01-25 / 阅读(110) / 评论(0) 分类 美国学生世界地理教材

By Phuong Tran Northern Niger 27 February 2008 For centuries, routes through the Sahara Desert have been used to transport goods. In recent years,4x4 convoys of cocaine and hashish have joined caravans bearing salt, cigarettes and fuel. VOA reporter

发表于:2019-01-31 / 阅读(101) / 评论(0) 分类 VOA常速英语2008年(二月)

By Jordan Davis Dakar 07 February 2007 Defense chiefs of the United States and nine African countries are wrapping up a two-day meeting in Dakar, Senegal on increasing military cooperation around the Sahara. As the conference was taking place in Sen

发表于:2019-02-08 / 阅读(95) / 评论(0) 分类 2007年VOA标准英语(二月)