单词：calf scours
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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
Most people bite their nails when they're nervous or get cravings for chocolate or crisps. 大多数人在紧张的时候有啃指甲的癖好，有些人会渴望吃巧克力或薯片。 But two sisters from Bradford have taken it to a whole new lev
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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
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 br
自然百科2008年
In this rugged and unforgiving terrain littered with fractured rock and ice-cold rivers, the slightest miscalculation may have fatal consequences. The snow leopard is the worlds highest living big cat. But theres another smaller predator that ranges
自然百科2010年
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