I am standing at the North Pole, the very top of the earth. Up here, it's easy to see why the Polar Regions are so cold. The sun never rises high enough in the sky to warm my back. And those rays that do strike the surface are mostly reflected back f

发表于:2018-12-03 / 阅读(42) / 评论(0) 分类 自然百科2011年

[00:00.00]Lesson 24 Flu and Colds [00:12.59]流感与感冒 [00:25.18]There's little escape from the common cold and influenza, better known as flu. [00:30.17]普通感冒和流感都很难预防。 [00:35.16]Most adults in the United States get two

发表于:2018-12-08 / 阅读(80) / 评论(0) 分类 赖世雄学英语第四册

THE FOUR DIAGNOSTIC METHODS-THE METHODS TO OBSERVE AND DIAGNOSE DISEASES四诊诊察疾病的方法 The four diagnostic methods, namelv inspection, auscultation and olfaction, inquiry, and pulse-taking and palpation, refer to the four basic procedure

发表于:2019-01-08 / 阅读(128) / 评论(0) 分类 医学英语

VOICE ONE: This is SCIENCE IN THE NEWS in VOA Special English. I'm Bob Doughty. VOICE TWO: Emergency hospital during 1918 influenza epidemic, Camp Funston, Kansas And I'm Faith Lapidus. This week, our subject is influenza, commonly called the flu. W

发表于:2019-01-11 / 阅读(51) / 评论(0) 分类 VOA慢速英语2008年(一)月

But the wonky holes will never be completely covered up, because coral cant grow in freshwater. Theyll remain an indelible reminder of the reef's past lives. But the origins of the reef lie even further back in time. And to understand them means crac

发表于:2019-01-22 / 阅读(36) / 评论(0) 分类 自然百科2011年

Stopping Childhood TB Deaths 预防儿童结核病死亡 Tuberculosis kills more than 74-thousand children every year. But health officials say those deaths are preventable. The World Health Organization and its partners have released a roadmap outli

发表于:2019-01-31 / 阅读(31) / 评论(0) 分类 VOA常速英语2013年(十月)