集约式放牧

This is Scientific American's 60-Second Science. I'm Adam Hinterthuer. Got a minute? Don't be fooled by those big bovine eyes and the mouth slowly chewing cudcows have a magnetic personality. At least thats the claim made by German researchers in the

发表于:2018-12-24 / 阅读(71) / 评论(0) 分类 Scientific American(八)月

We're traveling by train.Out the windows, we drink in the passing scene of cars on nearby highways, of children waving at a crossing, of cattle grazing on a distant hillside, of smoke pouring from a power plant, of row upon row of corn ad wheat, of f

发表于:2019-01-08 / 阅读(47) / 评论(0) 分类 英语美文

Premature and low birth weight babies are surviving as never before, thanks to treatments available in neonatal intensive care units. That's mainly true in rich countries. But a new study suggests that these high-tech, high-intensity hospital service

发表于:2019-01-13 / 阅读(45) / 评论(0) 分类 VOA标准英语2010年(十二)月

FOR ALL LITTLE BIRDS 为所有的小鸟 NANCY BYRD TURNER 南希伯德特纳 God who loves all things, 上帝爱万物, Folks and flocks and herds, 无论是人类,还是飞禽和走兽, Lend an ear to this my prayer 愿他垂听我的祈祷, For

发表于:2019-01-16 / 阅读(40) / 评论(0) 分类 美国小学英语教材4

LYNN NEARY, HOST: For the past decade, Boko Haram has been killing thousands across northeastern Nigeria, causing millions to flee from their homes. But now there's another conflict in Nigeria that's killing more people than Boko Haram and threatenin

发表于:2019-01-17 / 阅读(38) / 评论(0) 分类 2017年NPR美国国家公共电台4月

More than 1,200 intensive care units in 75 countries examined Carol Pearson | Washington, DC 08 December 2009 Researchers found that more than half of the 14,000 patients in the study on that one day, developed infections in intensive care units Stay

发表于:2019-02-12 / 阅读(47) / 评论(0) 分类 VOA标准英语2009年(十二月)