The United States and South Korea say they will be diligent about implementing U.N.Security Council sanctions imposed after North Korea conducted the second nuclear weapons test in its history in May.

VOA: standard.2009.09.06

If you start with only one, you have two pieces of DNA, then you'll get 2 to the Nth fragments after N cycles because each cycle you're doubling the number.

如果你从仅仅一个DNA开始,你有两条DNA链,经过N次循环后,就得到二的N次方个DNA片段,因为每次循环都使其数量翻倍

耶鲁公开课 - 生物医学工程探索课程节选

You pay every year a fixed amount on your house to the mortgage originator and then after so many-- n is 30 years, typically--you would then have paid it off.

你每年都在你的房子上支付一定数目的偿款,给抵押商然后,数年后,设n是30年,一般来说你已经能偿清贷款了

耶鲁公开课 - 金融市场课程节选

And the discovery of genetics and D.N.A.molecules took place long after his death.

VOA: special.2009.02.25

So,if you take number one--but we don't have to go through them all and I assure you we won't--if you take number one, the Ain,a-i-n,it's named after a river; or if you take number two,the Aisne,a-i-s-n-e, it's named after a river; and how many hundreds of thousands of people died along there in World War One or,you take number three,the same thing,Allier.

如果你看第一个省,我向你们保证,我们不用挨个了解,看第一个省,安省,a-i-n,来自一条河的名字,或是第二个埃纳省,a-i-s-n-e,来自于一条河的名字,有成千上万的人在这里死于,第一次世界大战,第三个,阿列省

耶鲁公开课 - 1871年后的法国课程节选

The U.N.Secretary General says the facts are "grim" in Haiti, after a 7.0 earthquake rocked the Caribbean nation Tuesday.

VOA: standard.2010.01.14

After he leaves New York, he will go to Chile and Brazil. He spoke to reporters after a meeting with the U.N.

VOA: standard.2009.03.25

After President Zelaya was forced from office in June in an army-backed coup he came to the U.N.

VOA: standard.2009.09.25

After that in cooperation with the U.N.Secretary General, the regional players should have to push for a real inclusive democratic transition in Burma."

VOA: standard.2009.05.31

As the skit continues, the teacher has a change of heart after another student recites their rights according to the U.N.Convention and according to the students themselves.

VOA: standard.2009.11.22

The second round was required after a U.N.-backed investigation into the vote found widespread fraud and a third of Mr.Karzai's ballots were declared invalid, reversing his outright victory.

VOA: standard.2009.10.28

After the visit to the U.N. the Queen and her husband Prince Philip, visit for the site of the September 2001 terrorist attacks on the World Trade Center Towers.

VOA: standard.2010.07.06

Tehran's U.N.Ambassador, Mohammed Khazaee, lectured the council after the vote,and said "no amount of pressure and mischief" will break Iran's "determination to pursue and defend its legal and inalienable rights."

VOA: standard.2010.06.09

Nearly 5,000 farmers in Burkina Faso, Cameroon,Ghana,Senegal, and Sierra Leone are exporting organically-grown produce to Europe, after gaining organic and fair-trade certification with help from the U.N.Food and Agriculture Organization.

VOA: standard.2010.04.11

After briefing the U.N. General Assembly committee that deals with these issues, Muntarbhorn told reporters that food aid is important, but that it should come with a "no access,no food provision".

VOA: standard.2009.10.22

After their talk on the sidelines of the U.N. General Assembly meeting in New York, Mr.Obama said the United States and Japan have a major role in working with other countries toward economic recovery.

VOA: standard.2009.09.23

Turkish Prime Minister Recep Tayyip Erdogan's stinging words came after Turkey withdrew its ambassador to Israel and and called the U.N.Security Council to an emergency meeting demanding an impartial investigation into Monday's deadly attack.

VOA: standard.2010.06.01

The Palestinians say they decided to take the matter of statehood to the U.N.Security Council out of frustration that 16 years after the signing of the Oslo accords there is still no peace agreement.

VOA: standard.2009.11.16

And it comes after a recent U.N.Security Council vote to impose another round of sanctions against Tehran for its nuclear program and the U.S.Congress's approval of harsher unilateral sanctions against nations that supply Tehran with gasoline.

VOA: standard.2010.06.29

But Marceil said it remained to be decided if there would be a five-way meeting on the subject, or just bilateral contacts on implementing the new U.N.sanctions resolution against Pyongyang approved after its latest nuclear test in late May.

VOA: standard.2009.07.15

Clinton said a North Korean missile launch, for any purpose, would be a provocative act and a violation of U.N.Security Council resolution 1718 - approved after its 2006 nuclear test- demanding an end to Pyonyang's nuclear weapon and missile programs.

VOA: standard.2009.03.25

Mr.Ban welcomed President Hamid Karzai's announcement Tuesday that he would accept a runoff with his closest rival, Abdullah Abdullah, after the U.N.-backed audit of the August 20 vote found nearly a quarter of all votes were fraudulent and had to be thrown out.

VOA: standard.2009.10.20

(Speech) Iran's official Arabic-language al Alam TV is reporting (No Transcripts) The Iranian Student News Agency reported earlier the head of the parliament's national security committee, Alaedin Borujurdi, would put the U.N.draft nuclear deal between Tehran and the West to a vote of his committee after discussing its pros and cons.

VOA: standard.2009.10.28