单词：duchesses
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河马对生态系统的意义 A new study says the hippopotamus is very important to the health of Africas rivers and lakes. Thats because hippos produce a key ingredient for aquatic life -- and a lot of it. But researchers warn that hippo populatio
VOA标准英语2015年(八月)
Hippos Called River Life Force 河马创造了河流生命力 A new study says the hippopotamus is very important to the health of Africas rivers and lakes. Thats because hippos produce a key ingredient for aquatic life -- and a lot of it. But resear
VOA标准英语2015年(四月)
AS IT IS 2015-05-03 Hippos: The Life Force of African Rivers 河马:非洲河流的生命力量 The hippopotamus is an animal very important to the health of Africa's rivers and lakes. Their dung, or solid waste, helps Africas aquatic ecosystem. But
2015年VOA慢速英语(五)月
Mr. McCauley would be upset when she left because shed given good service and it would be hard to replace her, but that would be all he thought about. Both he and his granddaughter were spoiled and self-centered. As for the neighbors, they would no d
英文短篇小说
STEVE INSKEEP, HOST: Fifty years ago today, a damaged oil well off the coast of Santa Barbara, Calif., caused what was then the largest oil spill in the history of the United States. The public reaction helped to shape the modern environmental moveme
2019年NPR美国国家公共电台1月