In the past decade an average of almost 400 events each year have met the U.N.criteria for a natural disaster.

VOA: standard.2009.10.14

Suppose someone has been investing money for n years and xi is the return on the investment in a given year.

假设有人投资了n年,Xi是第i年的收益率

耶鲁公开课 - 金融市场课程节选

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

At the U.N.climate change summit in Copenhagen last year, Senegal's president,Abdoulaye Wade, stressed the importance of planting the "Great Green Wall."

VOA: standard.2010.04.01

The Turkish Cypriot north and the Greek Cypriot south have been engaged in U.N.-led comprehensive negotiations since late last year.

VOA: standard.2009.09.05

The heads of state at the AU's last summit had asked the U.N.Security Council to use its power to defer the Bashir indictment for one year.

VOA: standard.2009.07.06

Individual Web addresses would then follow. U.N.Under Secretary General for Economic and Social Affairs Sha Zukang highlighted the reason for this year's conference, "Creating Opportunities for All,"

VOA: standard.2009.11.16

The comments followed an overwhelming vote in the U.N.General Assembly on a non-binding resolution condemning the 47-year-old U.S.trade embargo against Cuba and urging Washington to lift the restrictions.

VOA: standard.2009.10.28

In September,a power struggle erupted in violence in the lower Juba region between al-Shabab and Hizbul Islam, a clan-based Islamist-nationalist group which had been al-Shabab's main ally in its year-long battle to overthrow the U.N.-backed government in Mogadishu.

VOA: standard.2010.01.02

Mitchell said he is not discouraged about his mission's recent setbacks, including acrimonious exchanges over a recent U.N.report alleging possible war crimes in last year's Gaza conflict, citing the example of his successful Northern Ireland peace efforts in the 1990s.

VOA: standard.2009.11.25

U.N.Special Representative Radhika Coomaraswamy says during the past year, a significant number of child soldiers were released by the National Liberation Forces in Burundi and more children are to be released in the Central African Republic and the Philippines as a result of active intervention by the United Nations.

VOA: standard.2009.09.16