Some people say radio was invented by Guglielmo Marconi of Italy. Marconi sent the first radio communication signals through the air in eighteen ninety-five. In fact, no one person can be called the inventor of radio. Many people, including several Americans, helped to develop radio. You may not know their names. However, their work affected many people.
该音频有LRC字幕,点击图片查看所有含有LRC字幕的现金网开户 现金网开户讲解附字幕:词语典故:与农田有关的短语2010-01-31
In the early days of human history, people survived by hunting wild animals, or gathering wild grains and plants for food. Then, some people learned to grow crops and raise animals for food. They were the first farmers.
该音频有LRC字幕,点击图片查看所有含有LRC字幕的现金网开户 现金网开户讲解附字幕:奥巴马向国会发表讲话2010-01-30
President Obama gave his first State of the Union speech Wednesday night. He talked mostly about the economy, and he repeated some of his message the next day in Florida.
该音频有LRC字幕,点击图片查看所有含有LRC字幕的现金网开户 现金网开户讲解附字幕:美国年轻人媒体使用量增加2010-01-29
American children and teenagers have increased their use of entertainment media by more than one hour a day in the last five years. On an average day they now spend seven and a half hours using media.
Monday marks the fiftieth anniversary of a very famous civil rights protest in the United States the Greensboro sit-in. On February first, nineteen sixty, four black college students took seats at a restaurant counter in Greensboro, North Carolina. The counter was for white people only.
The Civil War ended in eighteen sixty-five. After that, tensions grew between Congress and the new president, Andrew Johnson.
该音频有LRC字幕,点击图片查看所有含有LRC字幕的现金网开户 现金网开户讲解附字幕:网络影响学生的写作用语?2010-01-28
Web browsers first appeared on computers in the early nineteen nineties. Since then, the Internet has greatly changed the way people communicate. But some teachers think the changes are not all for the better.
该音频有LRC字幕,点击图片查看所有含有LRC字幕的现金网开户 现金网开户:研究增进对语言和大脑的了解2010-01-27
A new study of the brain is helping scientists better understand how humans process language. The study is being done in San Diego, Boston and New York.
现金网开户:From 'Dracula'to 'Twilight,'Vampires Evolve...2010-01-27
More recent versions of vampires are in many books, movies and television series. The Twilight series of books and movies has increased the popularity of vampires around the world.
该音频有LRC字幕,点击图片查看所有含有LRC字幕的现金网开户 现金网开户讲解附字幕:关于植物利用水的新发现2010-01-26
Scientists have discovered more details about how plants use water. Their findings could help to engineer plants that grow better and more effectively in conditions with higher levels of carbon dioxide.
This year, the show took place between January seventh and tenth in Las Vegas, Nevada. A record three hundred thirty businesses attended for the first time. These can be manufacturers or suppliers who sell products from other companies. In all, there were over twenty thousand new products from more than two thousand five hundred businesses.
该音频有LRC字幕,点击图片查看所有含有LRC字幕的现金网开户 现金网开户讲解附字幕:预防蛇咬伤,改善治疗方法2010-01-25
Snakes bite an estimated five and a half million people worldwide each year. Experts say tens of thousands of people die from venom poisoning.An untreated or incorrectly treated bite might require the removal of a bitten foot, for example, or an arm. Each year around four hundred thousand amputations are the result of snakebites.
现金网开户:Seeking 'Cultural Equity' in Musical Traditions2010-01-25
We talked last week about John Avery Lomax and his work collecting American folk songs. He collected thousands of songs in the nineteen twenties, thirties and forties to save for future generations. His son Alan soon joined him, and continued collecting music after his father died in nineteen forty-eight.
现金网开户:Scott Joplin,1867-1917:The King of Ragtime Music2010-01-24
That song is called Maple Leaf Rag. Scott Joplin wrote it more than one hundred years ago. The song changed Joplin's life. It was very popular. The composer earned a good living from the sales of the sheet music. He also became famous.
该音频有LRC字幕,点击图片查看所有含有LRC字幕的现金网开户 现金网开户讲解附字幕:词语典故:与身体部位有关的短语2010-01-24
There are many American expressions that use parts of the body. These include the eyes, ears, nose, mouth and even the heart. Today we will tell you some expressions that use other body parts 每 the back, shoulders and chest.
该音频有LRC字幕,点击图片查看所有含有LRC字幕的现金网开户 现金网开户讲解附字幕:回顾奥巴马执政第一年2010-01-23
President Barack Obama has begun his second year in office. The forty-fourth president, and first African-American president, was inaugurated last January twentieth.
该音频有LRC字幕,点击图片查看所有含有LRC字幕的现金网开户 现金网开户讲解附字幕:奥巴马对银行施加限制2010-01-22
President Obama is proposing rules to limit the size of banks and the risks they can take. He wants to prevent banks from using government-insured deposits to make risky investments. He also wants to keep them from owning hedge funds or private equity funds.
The French Quarter and Garden District are two of New Orleans' most famous and popular neighborhoods. Walking through these historic areas, visitors today might find it hard to believe that a deadly storm swept through the city over four years ago.
该音频有LRC字幕,点击图片查看所有含有LRC字幕的现金网开户 现金网开户讲解附字幕:美国特许学校推行环保运动2010-01-22
Charter schools operate with public money but without many of the rules that govern traditional public schools. In the United States the rules for charter schools differ from state to state. But in general these schools have greater freedom to decide what to teach and how to teach it.
In the spring of eighteen sixty-five, the American Civil War was over. And the president who had led the Union during that war was dead. Abraham Lincoln had been murdered before the final surrender of Confederate forces.
现金网开户:2009:A Year of Discovery and Promise in Space2010-01-20
Possibly the biggest space story this year was the discovery of water on the moon. The best evidence was provided by a dramatic experiment carried out on October ninth. NASA used its Lunar Crater Observing and Sensing Satellite, or LCROSS, to look for water deep beneath the lunar surface.
现金网开户:How Loneliness Can Infect Social Networks2010-01-20
Loneliness has been linked to depression and other health problems. Now, a study says it can also spread. A friend of a lonely person was fifty-two percent more likely to develop feelings of loneliness. And a friend of that friend was twenty-five percent more likely to do the same.
该音频有LRC字幕,点击图片查看所有含有LRC字幕的现金网开户 现金网开户讲解附字幕:让草地休息一下2010-01-19
Grasslands need time to rest when cattle and other animals feed on them. Moving animals from one area of pasture to another can provide the time needed for new growth. This is called rotational grazing.
现金网开户:Revisiting the Accord From Copenhagen2010-01-19
Controlling rising temperatures was the subject of an international conference last month in Copenhagen, Denmark. The United Nations called the conference to replace a nineteen ninety-seven agreement, the Kyoto Protocol. The protocol contains measures designed to fight climate change.
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