单词：cryptogenic species
单词：cryptogenic species 相关文章
The cold climate conifer forests of the north displaced broadleaved woodlands. Plants and animals were gradually pushed south to find a warmer climate. Florida became a refuge from the cold. Down here is where the Ice Age north met the subtropical so
探索与发现2013年
AS IT IS 2013-05-24 New Study Predicts Huge Species Loss from Climate Change From VOA Learning English, this is At It Is. Welcome! Im Caty Weaver. This week, American scientists said carbon dioxide in Earths atmosphere had risen to its highest level
2013年VOA慢速英语(六)月
This is the VOA Special English Agriculture Report. Mangroves are unusual looking trees. They have roots that stand in saltwater and look like cables or ropes laid one on top of another. Mangroves are not just pretty -- they help the environment. But
2010年VOA慢速英语(四)月
Ocean Floor Reveals Past Climate Changes Time capsule Lamont research professor Maureen Raymo, the director of the Core Repository, slides open a long, narrow drawer from the cabinet. Like thousands of others here, the drawer contains a long, thin cy
VOA标准英语2012年(一月)
Tree Deaths Linked to Climate Change Stanford University graduate student William Anderegg has seen this forest die-off firsthand. His doctoral thesis documents the impact of drought on trembling aspen, the most common tree in North America. These ar
VOA标准英语2012年(九月)
Scientists Recreate Ancient Mating Call from Dinosaur Age It was probably a noisy world, with thousands of other animal sounds, rushing streams and the rustle of giant ferns and coniferous trees. Fernando Montealegre studies how insects sing and hear
VOA标准英语2012年(二月)