Scientists try to document as many past El Nino events as possible by piecing together bits of historical evidence, such as sea-surface temperature records, daily observations of atmospheric pressure and rainfall, fisheries records from South America

发表于:2018-12-19 / 阅读(36) / 评论(0) 分类 托福英语

JUDY WOODRUFF: The Great Barrier Reef along the coast of Australia is considered one of the greatest natural wonders of the world. It actually consists of more than 2,900 smaller reefs and 900 islands and countless species of fish. But its health and

发表于:2018-12-31 / 阅读(42) / 评论(0) 分类 PBS访谈环境系列

In a giant hanger in Bedford, the largest aircraft in the world is having some finishing touches, this wing is a fresh addition, next up another engine, this is the Airlander 10, the 92-meter long aircraft will have its first test flight in just a fe

发表于:2019-01-02 / 阅读(46) / 评论(0) 分类 英伦广角

AGRICULTURE REPORT - Legumes: Good for People and SoilBy Bob Bowen Broadcast: Tuesday, February 21, 2006 I'm Steve Ember with the VOA Special English Agriculture Report. Many different kinds of plants

发表于:2019-01-02 / 阅读(47) / 评论(0) 分类 2006年慢速英语(二)月

Scientists have found that levels of a now-banned chemical are rising again in Earths atmosphere. The chemical is called CFC-11. It is the second most common kind of CFC, short for chlorofluorocarbon. Chlorofluorocarbons were once widely used in many

发表于:2019-01-03 / 阅读(92) / 评论(0) 分类 2018年VOA慢速英语(五)月

Broadcast: Apr 09, 2003 Two U.S. astronauts took a spacewalk Tuesday to perform exterior maintenance on the International Space Station. It was the last opportunity to fix hardware while the outpost h

发表于:2019-01-03 / 阅读(242) / 评论(0) 分类 VOA2003(上)-科技先知

为实现自己的留学之梦,无数学生默默地在GRE考试中付出自己辛勤的汗水。所有GRE高分故事背后都有值得我们学习的GRE备考经验。相信这样的一个个GRE高分故事能够在你备考GRE考试的过程中送

发表于:2019-01-03 / 阅读(61) / 评论(0) 分类 GRE英语

Beijing's environment authorities last Friday vowed zero tolerance to falsification of environmental figures, after Net users complained that mist cannons, or the magic smog cleaner, are used around the capital's air quality monitoring stations so th

发表于:2019-01-07 / 阅读(56) / 评论(0) 分类 英语新闻

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. We humans have always pondered the heavens. Astronomy and physics have come out of our wonder at the points of light in the darkness. Scientists now wa

发表于:2019-01-08 / 阅读(67) / 评论(0) 分类 Scientific American(十)月

In the day of the dinosaur, insects had wingspans of nearly 2.5 feet. So why are today's bugs so puny? According to researchers at U.C. Santa Cruz, we may have birds and bats to thank. Their concludes appear in the Proceedings of the National Academy

发表于:2019-01-08 / 阅读(95) / 评论(0) 分类 Scientific American(六)月

After a long battle, Republican Norm Coleman has conceded defeat to Democrat Al Franken in Minnesota Senate race. That follows a state Supreme Court ruling in favor of Franken today. NPR's Cathy Shaw reports. The unanimous court ruling came after an

发表于:2019-01-08 / 阅读(112) / 评论(0) 分类 2009年NPR美国国家公共电台7月

This is the VOA Special English Agriculture Report. A study from Canada says fish farms are a threat to some populations of wild salmon. It says the danger is from sea lice, which are small organisms that feed on fish. The researchers say these para

发表于:2019-01-11 / 阅读(69) / 评论(0) 分类 VOA慢速英语2008年(一)月

Science and technology 科学技术 Climate change 气候变化 Good news at last? 终于来了好消息? The climate may not be as sensitive to carbon dioxide as previously believed 气候对二氧化碳的敏感性可能低于先前的预期 CLIM

发表于:2019-01-16 / 阅读(41) / 评论(0) 分类 经济学人科技系列

倏忽即逝的链状闪光在云层里驰掣游动,时而飞出云底,时而钻入云中,明明灭灭,蔚为壮观。草原中被雷电击中的孤树散发着焦糊味,冒着烟;他们终于明白这些孤零零的牧场卫士为何死去

发表于:2019-01-29 / 阅读(55) / 评论(0) 分类 荆棘鸟

Carrying out international-level research and an annual research income of around £15 million, Oxford is one of the leading chemistry research departments in the world. 作为全球顶尖的化学科研部门之一,牛津大学致力于进行国际

发表于:2019-01-29 / 阅读(72) / 评论(0) 分类 走进牛津大学

Hawaiian monk seal births are on the rise, according to The Marine Mammal Center. 据海洋哺乳动物中心称,僧海豹出生率在上升。 The species is considered critically endangered, with fewer than 1,200 individuals left in the wild. Sci

发表于:2019-02-07 / 阅读(35) / 评论(0) 分类 阅读空间

Have you ever been floating in a swimming pool, all comfy and warm, 你是否曾经浮在游泳池里,感觉非常惬意,暖洋洋得, thinking, Man, it'd be cool to be an astronaut! 想着,天啦,当一名宇航员太爽了! You could fl

发表于:2019-02-13 / 阅读(63) / 评论(0) 分类 TED演讲教育篇

Jet streams, usually located about 30,000 to 35,000 feet up, can bowl along at up to 180 miles an hour and vastly influence weather systems over whole continents, yet their existence wasn't suspected until pilots began to fly into them during the Sec

发表于:2019-02-25 / 阅读(59) / 评论(0) 分类 万物简史

Its surface temperature is a roasting 470 degrees centigrade (roughly 900 degrees Fahrenheit), which is hot enough to melt lead, 它的表面温度高达470摄氏度,连铅都会熔化。 and the atmospheric pressure at the surface is ninety times

发表于:2019-02-25 / 阅读(64) / 评论(0) 分类 万物简史

Maybe. A change in barometric readings may be part of the reason: Atmospheric pressure often drops right before bad weather sets in; this shift could cause body tissue to expand, which can lead to swelling and pain. 也许吧,气压变化有可能是

发表于:2019-03-06 / 阅读(140) / 评论(0) 分类 英语听力广播—Listening