单词：calf white scours
单词：calf white scours 相关文章
Scientists Test Different Ways for Saving Rhinos 科学家们尝试不同的方式拯救犀牛 The African rhino is a seriously endangered species and one subspecies, the northern white rhinoceros, is on the brink of extinction. After the recent deat
VOA标准英语2015年(八月)
In animals, this part of the brain evolved around the time of the dinosaurs before mammals existed. It's hardwired to beat starvation. For three days Jean-Luc has been trapped underground. He hasn't had a morsel to eat. He doesn't know it, but his b
国家地理2008年
This is Scientific American's 60-Second Science. I'm Adam Hinterthuer. Got a minute? At Antarcticas Blood Falls, the ice is stained red by ancient, iron-rich water pouring out of subglacial lakes formed millions of years ago. The cascading water is e
Scientific American(四)月
科学家们通过不同的方式拯救犀牛 The biggest threat to rhinos are poachers who kill them for their horns. 对犀牛而言最大的威胁是偷猎者为了它们的角而将其置于死地。 In spite of a lack of scientific proof, many i
VOA标准英语2015年(十二月)
Weekly Address: Taxpayer Subsidies for Oil Companies are Neither Right, nor Smart, and They Should End 每周电视讲话：用纳税人的钱为石油公司提供补贴既不正当，也不明智，必须终止 WASHINGTON As oil and gas companies ma
奥巴马每周电视讲话