单词：alluvial clay
单词：alluvial clay 相关文章
By Gary Garriott Broadcast: September 15, 2003 This is Robert Covent with the VOA Special English Development Report. 1)Clay is found almost everywhere in the world. It is formed by the action of wind
VOA2003（下）-发展与科学
There was a handful of clay in the bank of a river. It was only common clay, coarse and heavy; but it had high thoughts of its own value, and wonderful dreams of the great place which it was to fill in the world when the time came for its virtues to
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Better known for its diamond fields, gold exploration and mining in Sierra Leone is on the increase. The British company, Cluff Gold, has announced it will build a mechanized gold mine in the southern Kangari hills after finding large deposits of gol
VOA标准英语2010年(四)月
They may be a little safer here. But the food in the forest is far less nutritious than on the riverbanks. If they want to eat well and avoid wolves this winter, they'll need to keep on moving. As the elk move gradually downwards, they follow the riv
自然百科2012年
By Naomi Schwarz Dakar 04 December 2007 Diamonds from Sierra Leone have fueled the country's gruesome civil war and enriched warlords. Now, the government and activists are trying to make sure the profits from Sierra Leone's post-conflict diamonds he
VOA常速英语2007年（十二月）