单词:ultra shortwave
单词:ultra shortwave 相关文章
US Christian Broadcaster Still Believes in Shortwave Since the dawn of wireless communications, international broadcasters, including the Voice of America, have used shortwave radio to communicate with the world. While many broadcasters now are switc
One of the world's most amazing migration is about to begin in earnest: 300 million monarch butterflies spread across North America are about to converge on small forests in the mounts of Mexico. This year, the butterflies have an unusual company as
This is the VOA Special English Technology Report. 这里是美国之音慢速英语科技报道。 A shortwave radio might seem like ancient technology these days. But for some people, it remains their only link to the wider world. 短波收音机如今
China has long depended on coal-burning power plants to fuel its explosive growth over the past three decades. As a result, air pollution has risen to alarming levels in central and eastern regions. Policymakers have been working hard to shift the co
Showcasing interesting and innovative online destinations Art Chimes | Washington, DC 04 December 2009 It fades in and out. ... But what I think that does is that adds a feeling of mystery. Time again for our Website of the Week, when we showcase int
VOA's weekly science and technology radio magazine Art Chimes | Washington, DC 04 December 2009 MUSIC: Our World theme This week on Our World: Climate change and its impact on health, ahead of the Copenhagen climate conference ... another hazard in c