国家地理-2008-03-20 Rho Ophiuchi Cloud 璀璨的星云

Rho Ophiuchi dark cloud is one of the closest star-forming regions to our own solar system. Located near the constellations Scorpius and Ophiuchus, the nebula is about 407 light years away from Earth. The infrared astronomical satellite, now celebra

创新英语-Scientists Create Energy-Making Artificial Leaf

Scientists at the Massachusetts Institute of Technology (MIT) have created what could be a breakthrough in providing clean, alternative energy. Researchers have invented an artificial leaf that splits water into hydrogen and oxygen and stores the ene

奥巴马演讲视频：President Obama on His Birth Certificate & the Real Issues Facing America

THE PRESIDENT: Hello, everybody. Now, let me just comment, first of all, on the fact that I can't get the networks to break in on all kinds of other discussions -- (laughter.) I was just back there listening to Chuck -- he was saying, its amazing tha

20 The Historical Significance of American Revolution

20 The Historical Significance of American Revolution The ways of history are so intricate and the motivations of human actions so complex that it is always hazardous to attempt to represent events covering a number of years, a multiplicity of person

英语语法：89 Stacked Modifiers

Todays episode concerns a what-you-may-have-been-wondering-about topic. That sure was a mouthful, and it illustrates the problem of stacked modifiers, which occurs when you string together too many words to describe a noun at the end of the mouthful.

60秒科学:Artificial Muscle Brings Back Blink

Artificial Muscle Brings Back Blink A study in the Archives of Facial Plastic Surgery reports the development of an artificial muscle system that could restore the ability to blink to stroke and injury patients. Cynthia Graber reports Most of us blin

英语语法：50 Funny Misplaced Modifiers

Grammar Girl here. Today guest-writer Bonnie Trenga is going to help us take a break from serious grammar and instead delve into the world of comedysome intentional, some not. Groucho Marx said it best: One morning I shot an elephant in my pajamas. H

2007年VOA标准英语-Former CIA Officer Testifies White House 'Reckl

By Dan Robinson Capitiol Hill 16 March 2007 Former undercover CIA officer Valerie Plame, who has been at the center of a controversy involving the role White House officials played in revealing her identity, has testified in public for the first tim

Lesson 95 - ON A CLOUD / UNDER A CLOUD

on a cloud under a cloud 你们肯定都知道英文里的前置词有时会使人很混乱，它们在句子里虽然不显眼，但是作用却很关键，用错了一个前置词意思可能完全不

2006年VOA标准英语-Ivory Coast Identification, Disarmament Slowly

By Franz Wild Abidjan 24 May 2006 Charles Konan Banny greets villagers in Meagui In war-divided Ivory Coast disarmament and personal identification, the two obstacles to elections, saw partial success in a pilot program this week. There is little si

VOA标准英语2011--Doctors Achieve Milestone Using Artifici

Doctors Achieve Milestone Using Artificial Heart With No Beat In March, two doctors at the Texas Heart Institute in Houston achieved what medical experts call a major milestone by implanting a continuous-flow artificial heart in a human patient. The

Artificial Leaf Turns Sunlight into Electric Power

Scientists at the Massachusetts Institute of Technology have turned to Mother Nature for inspiration, inventing a device that mimics photosynthesis, the process plants use to convert sunlight and water into usable energy. MIT chemistry professor Dani

ICRC Seeks Access to All of Libya as Conflict Intensifies

The International Committee of the Red Cross is appealing for access to all areas of conflict in Libya as fighting intensifies. The president of the ICRC, Jakob Kellenberger, says the conflict in Libya has descended into civil war. He says he is alar

VOA标准英语2011--Artificial Blood Vessels Work Well, Have

Scientists say they have successfully tested artificial blood vessels grown in the laboratory. In a heart bypass operation, surgeons typically remove a vein from a patient's leg and use it to replace blocked arteries that feed the muscles of the hear

VOA标准英语2009年-New Commander Says US Commitment to Pacifi

By Al Pessin Honolulu, Hawaii 20 October 2009 Command of U.S. forces in Asia and the Pacific and Indian Oceans passed to a new commander on Monday at a ceremony in Honolulu, Hawaii. Navy Admiral Robert Willard said the U.S. commitment to the region

英语语法：70 Misplaced Modifiers

Grammar Girl here. Today's topic is misplaced modifiers. Of all the writing errors you can make, misplaced modifiers are among the most likely to confuse your readers, but they're also kind of fun because misplaced modifiers can give your sentences s

揭秘新科技 Wifi信号能治病

Researchers have developed a method to activate electronic implants in the body and eliminate bacterial infections using a wireless signal。 研究者已经开发了一种运用无线信号激活人体中电子植入物来消除细菌感染的方法。

Wifi信号弱？放置地点有问题

Deciding where to place a Wi-Fi router at home to minimise signal blackspots is a fine art. But a physicist has attempted to tackle the problem by mathematically working out the optimum position for a router. He studied how walls and reflections affe

US Identifies Marines in Urination Video

U.S. military officials say they have identified the four Marines seen on video urinating on the bodies of dead Afghan Taliban fighters. The Naval Criminal Investigative Service, heading the main inquiry into the video, has also reportedly questioned

VOA标准英语2010年-New Negotiations Aim at Cyprus Reunifi

Leaders of the Greek and Turkish communities of Cyprus are starting a new series of negotiations aimed at re-unifying the divided island. Cypriot President Demetris Christofias and Turkish Cypriot leader Mehmet-Ali Talat have begun a series of three-