超高频信号产生器

科学家研制奔跑如猎豹的机器人 Scientists have been experimenting with four-legged robots for years, trying to see if they could be used as pack animals for carrying heavy loads over a difficult terrain. But the machine's power requiremen

发表于:2018-12-02 / 阅读(61) / 评论(0) 分类 VOA双语新闻 2014年12月

AS IT IS 2015-09-08 Missile Silos Turned into 'Survival Condos' 导弹发射井变成生存公寓 When looking for a new home, many people consider things like the safety of the area, the nearness to public transportation or the quality of the neighb

发表于:2019-01-12 / 阅读(39) / 评论(0) 分类 2015年VOA慢速英语(九)月

By Nico Colombant Dakar 29 November 2006 Entrepreneurs are making money from Africans dreaming of migration. These include businessmen who have set up tents to facilitate the application process for the yearly United States green card lottery. VOA's

发表于:2019-01-12 / 阅读(97) / 评论(0) 分类 2006年VOA标准英语(十一月)

By Benjamin Sand Kabul 04 August 2006 Afghanistan's capital, Kabul, faces a crippling energy shortage with basic electricity only available six hours a day. Officials say demand is soaring, but international support for the city's energy needs is be

发表于:2019-01-20 / 阅读(96) / 评论(0) 分类 2006年VOA标准英语(八月)

It is hard to escape the images of Konza City in Kenya. Advertisements promoting the future high-tech hub, or technopolis, appear daily in the country's newspapers and show regularly on the state television network. The ambitious plan is the work of

发表于:2019-02-06 / 阅读(52) / 评论(0) 分类 英语新闻

Models of China's high-speed trains are on display from China Railway Rolling Stock Corporation, one of the participants of this year's trade fair. Zhou Li, head of the science and technology department of China Railway says the trains can bear extre

发表于:2019-02-18 / 阅读(32) / 评论(0) 分类 英语新闻