Practice Listening

Rat ung ho ban Maroon_Opal da chiu kho lap nen chu de nay, minh cung ung ho 1 duong link de luyen nghe TA, duong link nay chac cung nhieu ng biet, nhung chac cung it ng biet cach download bai nghe ve de nghe di nghe lai , neu moi ng co nhu cau (tat nhien la voi nhung ai chua biet cach download) minh se post chi tiet cach download ve, nhung de nghe dc mot cach hieu qua, co ban nao co y kien gi hay thi post len luon nhe..

Fù fù, quen mat k post duong link :
http://www.bbc.co.uk/vietnamese/learningenglish/

Thanx for sharing, ori
Mục đích của Maroon khi lập topic này ra tạo ra một classroom online để mọi người cùng học chung với nhau, bởi vì học một mình sẽ rất buồn, chán và trở nên chây lười.
Mình kg có ý định chỉ giới thiệu một web site hay, rồi tự các bạn mạnh ai nấy học, để rồi sau đó topic này die luôn. Mình muốn topic này được duy trì as long as possible và có thật nhiều bạn bè vào đây cùng giúp nhau tiến bộ. Vì thế mình rất vui nếu ori cùng tham gia

Marool có ý kiến rất hay là mở topic để mọi người cùng học cho có khí thế. Tuy nhiên mình vẫn mong Orijo chỉ giúp mọi người cách down load bài nghe trên bbc về nghe lại. Mình có nghe vài bài trên bbc, nhưng mỗi khi muốn nghe lại thì lại phải vào mạng, như thế vừa không tiện lại mất thời gian tìm kiếm. Cám ơn Orijo nhé.

E*** bài của thuvan_dkh
I?Tm Steve Ember and I?Tm Faith Lapidus with Explorations in VOA special English. Today we tell about one of the most important research fields in technology. It is called nanotechnology. It?Ts the science of making things unimaginably small. But there is nothing small about the problems that scientists hope nanotechnology will solve.
Nanotechnology gets its name from a measure of distance. A nanometer, or nano, is one-thousand-millionth of a meter. This is about the size of atoms and molecules. Nanotechnologists work with materials this small.
Many experts cre*** the idea to physicist Richard Feynman. In 1959, this Nobel Prize winner gave a speech. He called it "There''s plenty of room at the bottom". Mister Feynman discussed the theory that scientists could make devices smaller and smaller - all the way down to the atomic level.
Although he did not use the word nanotechnology, the speech got many scientists thinking about the world of the very small. But for years this ideal remained only a theory.
At the time, no way existed to record structures the size of molecules, not even a electron microscope could do the job. But as the 1980s began, two researchers found the way. Gerd Binnig and Heinrich Rohrer worked at a laboratory in Zurich Switzerland. They worked for IBM, the American company international business machines.
They invented what they called a scanning tunneling microscope. This permitted scientists(kg có s) to observe molecules and even atoms in greater detail than ever before.
Once they could see nano-sized structures, the next step for scientists was to find a way to create their own. By the middle of the 1980s, scientists had increased their research on carbon. They were interested in the ability to use this common element to make nano-sized structures. Carbon had already been engineered in chemical reactions to make long poly-carbon chains. Today, the result of carbon chemical engineering is everywhere - in the form of plastic.
Scientist in 1980s wanted to created nano-structures from carbon atoms. In 1985, Robert Curl, Harold Kroto and Richard Smalley succeeded. They aimed a laser at carbon. This powerful light caused some of the carbon to become a gas.
The scientists cooled the gas to an extremmely low temperature. Then they looked at the carbon meterial that remained. They found, among several kinds of carbon, a molecule of sixty atoms - carbon sixty.
Carbon sixty is a group of tightly connected carbon atoms that forms a ball. It is a very strong structure. This is because all the atoms share any loosed(kg có d) electrons that might take part in chemical reactions with other atoms. This kind of molecular carbon can also appear with different numbers of carbon atoms. There is also carbon 70 for example.
For their work, Robert Curl, Harold Kroto and Richard Smalley received the Nobel Prize in Chemistry in 1996.
The next nano-structure development came in 1993, Japanese scientist Sumio Iijima of the company NEC developed carbon nanotubes. These nano-sized objects are really six-sized atomic structures connected to form a tube. They are extremely strong. Scientists believe that someday nanotubes could replace carbon graphite now used to airplane parts.
Soon after this discorvery, researchers started to think about using nanotubes to build the extremmely small devices.
In 2003, IBM announced that it had made the world''s smallest light. Reseacher used a carbon nanotube attached to a silicon base. They sent opposing electrical charges down the tube. The reaction between the charged particles produced an extremmely small amount of light. IBM says the wavelength of light produced could be used in communications.
Nanotubes appeared (kg có ed) to have many different uses. Scientists at university of Texas at Dallas have developed a way to make a flat material, or film, out of nanotubes. The researchers created (kg có ed) the surper thin film by a chemically growing nanotubes on a piece of glass. They use another piece of sticky material to remove the film of nanotubes from the glass. When the film is finished, it is only 50 nanometers thick. That is about 1/1000 the width of human hair.
The material is extremmely strong and it carries electricity as well. Reseachers think the nanotube material could be used to make car windows that can receive radio signals. They also believe it could be used to make solar electricity cells, lights or thin, movable displays that show pictures like a television.
Nano-materials are already being used in some products. For example, materials using mixtures of nano-materials are being used to make sporting goods like tennis balls and tennis rackets better.
Soon, nano-materials could be used to improve devices that reduce pollution released by cars. Similar technology could be used to warn of the presence of poisonous molecules in the air.
Computer scientists hope developments in the nanotechnology will help break barriers of size and speeds (kg có s). In 1965, electronics expert Golden Moore recognized that computer chips, the engines that drive computers, would quickly grow in power.
He even thought of a way to measure this progress. He said researchers with double the number of tiny transistors on a computer chip about every two years. A transistor is a device that controls electrical current.
That statement is known as Moore?Ts law. It has proved correct for more than forty years. Mr Moore would go on to help start the company Intel, one of the world''s leading computer chip makers. And Moore?Ts law is one of the most talked about scientific barriers.
In 1971, Intel created a computer chip containing 2300 transistors. In 2004, Intel made a chip with 592 million transistors. But current technology has reached its limit. The next jumpe (kg có e) to 1000 million transistors will require new discoveries in nanotechnology.
Researchers are trying to solve the problems of creating nano-sized transistors. In 2002, IBM annouced that it had created the world''s smallest transistor based on the element silicon. IBM said that the transistor was 4 to 8 nanometers thick.
In 2005, with researchers for the company Hewlett Packard wrote about the problems of creating nano-transistors in a magazine Scientific American. They said transistors are often measured by the distance between the middle of two current-bearing wires. Their nano-wire transistor measured 30 nanometers in size. They said the smallest transistor currently used in a computer is 90 nanometers. But making nano-transistor small enough to meet the demands of Moore?Ts law may be years in the future.
Although nanotechnology is exciting, there are concerns about the safety of super small structure. Scientists and environmental activists worry that nano-materials could pass into the air and water causing health problems.
There is reason for concern. A study by NASA researchers found that nano-particles caused severe lung damage to laboratory mice. Other studies suggest that nano-particles could suppress the growth of plant roots or could even harm the human body?Ts ability to fight infection.
The environment protection agency says there is not much known about the effects of nano-structures in the environment. This is because the laws of physics do not work in the same way at the level of the extremmely small. The EPA recognizes that this could mean that there are unknown health risks involved in nanotechnology.
The government is expected to spend about 39 million dolars on research meant to investigate the health risks of the nano-materials. But that is less than 4% of total government spending , which will be more than one thousand million dolars this year.
Many environmental groups say at least 10% of that total ? (còn tiếp)
Phù, mệt quá

To Maroon_Opal: đồng ý với ý kiến của bạn M, khi có tg mình sẽ post bài, thực sự món Listening là món mình thấy khoai nhất, luyện mãi mà vẫn thấy ... cần phải luyện nữa

To thuvan_dkh: mình sẽ gửi riêng cho bạn cách download từ BBC nhé

Lam on cho biet cach Download moi. Tui rat rat rat can. . Neu co the xin mail dum ve dia chi sau: lantaitrau@yahoo.com

Thanks Maroon nhé. Tui đọc lại, nghe lại, cũng thấy mệt. Mệt quá trời.
Orijo à, gửi cách down cho mình vào địa chỉ thuvan_dkh@yahoo.com.vn nhé.
Cảm ơn mọi người!

Còn khúc cuối, post lun roài chúng ta nghe bài mới nhé pà koan. Bài nì đảm bảo ngắn ngủn hè.
Many environmental groups say at least 10% of that total is needed. They say private industry needs to spend more on safety research. And, they say, the government needs to develop rules for nano-materials, which are already being made in hundreds of places around the country.
This program was written and produced by Mario Ritter. I?Tm Faith Lapidus. And I?Tm Steve Ember. Join us again next week for Explorations in VOA Special English.
Bài kỳ này sẽ đề cập đến dịch cúm gà nè:
Bird Flu: Hoping for the Best, but Preparing for the Worst
Tên riêng:
Shigeru Omi
Nancy Steinbach

I?Tm Steve Ember with in the news in VOA special English. There are more warnings about the need to prepare for possibility of the worldwide outbreak of bird-flu. VOA ??? in Tokyo reported Friday on the result of 2 days meeting held by Japan and the world health organization. The genetics from more than 20 countries discussed a plan, they hope might contain early spread of any influent pandemic. WHO western pacific director Shigeru Omi said containment alone is not enough. He said all the possible options must be used. That includes doing more to watch for the reach of person to person infection. Dr Omi also said some countries need to be more open about reporting infections in animals and people. He did not say which countries. The WHO said about 1,500.000.000$ will be needed over 3 years to prepare for a pandemic. A meeting next week in Beijing will deal with how to pay for it. The world bank has just offered 500.000.000 $. The current outbreak of bird-flu began in Southeast Asian in December of 2003, leading to about 80 dead. Health officer say the victims have been mostly young people, who has close contact with infected birds or sick people. China and Turkey have reported the most reason human infections. The WHO said the H5N1 virus already has met 2 of the 3 con***ions for a pandemic. It is new, so there no natural protection and it can make people very sick. The third con***ion is that the virus must change into the form that can pass easily form person to person. WHO?Ts officer said tests on 2 people, who died in Turkey, found a small genetic change in the virus. But they say it is too soon to know how this might effect the spread of the virus. They say similar changes appeared in 2003 in Hong Kong and last year in Vietnam. Experts continue to learn more about the virus. New research may show it to be more wide spread but not as deadly as people had talked. This week the all kind of internal medicine public ??? by Swiss and Vietnamese scientist. Their findings suggest that sick or dead birds can spread ??? avian influence ??? to humans. They say doctor may be seeing only the most severe cases. The WHO is taking no chances as once every country to develop a plan. France, for example has now plan together enough ??? and medicines for all its people. European Union countries have until February,7 to purpose how they will keep watch for bird-flu. EU officers this week extended a testing program for ??? and wide birds. In the USA ??? includes new public guidelines about how to prepare for a pandemic. The government has a website pandamicflu.gov. More information about avian influence ??? can also be found at who.int and at voanews.com. In the news in VOA special English was written by Nancy Steinbach. I?Tm Steve Ember.
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