单词：alluvial filtration
单词：alluvial filtration 相关文章
Beijing will launch a pilot program to equip schools and kindergartens with air filtration devices. Smog has been a significant issue in the Chinese capital this winter. I was coughing just now, I always wear mask, from school to home. The air is cho
2017CRI中国国际广播电台
Conservation Project at Risk from Mai Mai Attack The hunt continues for the Mai Mai militia that attacked a DRC conservation project in June. Six people were killed, as well as 14 endangered animals called Okapi, or forest giraffe. The attack occurre
VOA标准英语2012年(七月)
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）
By Tabinda Naeem Washington, D.C. 21 May 2007 Two years ago, the National Academy of Engineering established the Grainger Challenge Prize for Sustainability. This $1 million award was designed to challenge the world's scientists to develop a practica
2007年VOA标准英语（五月）