准双曲形反射器

by Jason Marshall Weve now talked about three methods for calculating average values: the mean, median, and mode (affectionately known as the three Ms). So, are we done? Is that everything we could ever want to know about interpreting average values?

发表于:2018-12-07 / 阅读(238) / 评论(0) 分类 数学英语

By Dan Robinson Two U.S. lawmakers just returned from Sudan say the situation in the western Darfur region remains intolerable, and are urging the government in Khartoum to take further actions to all

发表于:2018-12-08 / 阅读(173) / 评论(0) 分类 VOA2004(下)--新闻盘点

丹尼尔看医生时,医生说他患了流感,要打针。小孩好像都很怕打针,我们的丹尼尔呢,他也怕吗?往下看就知道了。 Listen Read Learn Doctor 3: What seems to be the problem, kid? Daniel: I've got a sore throat, a runny nose and a headache. Doctor 3: AhHow long

发表于:2018-12-26 / 阅读(236) / 评论(0) 分类 英语口语大赢家

Oscar Pistorius is the South African Paralympic runner famous for trying to compete at the Olympics. He is known as Blade Runner because of the artificial limbs he uses to sprint. He is also dubbed the fastest man on no legs. Pistorius is the double

发表于:2019-01-01 / 阅读(266) / 评论(0) 分类 各国名人英文介绍

Sonja Pace Israeli troops have withdrawn from one key neighborhood of the Rafah refugee camp in the southern Gaza Strip, lifting a six-day siege and allowing residents out of their homes to again move

发表于:2019-01-03 / 阅读(193) / 评论(0) 分类 VOA2004(上)--国际时事

分集介绍:指数,log,对数微分;双曲函数 Exponential.and.log.Logarithmic.differentiation;.hyperbolic.functions

发表于:2019-01-05 / 阅读(497) / 评论(0) 分类 麻省理工学院公开课:单变量微积分

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? The 2011 Nobel Prize in chemistry goes to Daniel Schechtman of the TechnionIsrael Institute of Technology in Haifa. Schechtman discovered what are called quasicrystals.

发表于:2019-01-08 / 阅读(334) / 评论(0) 分类 Scientific American(十)月

By Peter Heinlein Shimelba Refugee Camp, Northern Ethiopia 31 October 2007 Rising tensions between Ethiopia and Eritrea have led to an increasing flow of refugees across their common frontier. A border war between the Horn of Africa neighbors from 19

发表于:2019-01-09 / 阅读(191) / 评论(0) 分类 2007年VOA常速英语(十月)

PRETORIA, Feb. 20 (Xinhua) -- The second day of paralympian Oscar Pistorius' bail hearing ended on Wednesday without a court ruling on his application. Magistrate Desmond Nair ruled that Pistorius would remain in custody again at the Brooklyn police

发表于:2019-01-11 / 阅读(240) / 评论(0) 分类 英语新闻

PRETORIA, Feb. 19 (Xinhua) -- The Pretoria Magistrate Court on Tuesday postponed Paralympian Oscar Pistorius' bail hearing to Wednesday. Magistrate Desmond Nair ruled that the bail hearing be heard under Schedule 6 Offence of the Criminal Procedure A

发表于:2019-01-11 / 阅读(284) / 评论(0) 分类 英语新闻

By Douglas Bakshian Manila 08 April 2008 A chapter of history is closing in the Philippines as the last Vietnamese refugees in the country head for Canada in a humanitarian program called Freedom At Last. They are the last of an estimated 2,500 Vietn

发表于:2019-01-11 / 阅读(208) / 评论(0) 分类 VOA常速英语2008年(四月)

By Greg Flakus Houston 24 March 2008 Results of an internal party election in Mexico have raised fears of more political turmoil with possible implications for the United States as well. VOA's Greg Flakus has the story from our Houston bureau. At a t

发表于:2019-01-12 / 阅读(254) / 评论(0) 分类 VOA标准英语2008年(三月)

By Brian Wagner Miami 02 October 2007 Ecuador's leftist President Rafael Correa is promising to move quickly on government reforms following Sunday's vote that apparently gave his supporters a majority in a special assembly to rewrite the country's c

发表于:2019-01-16 / 阅读(269) / 评论(0) 分类 2007年VOA常速英语(十月)

Anjana Pasricha India's prime minister-designate Manmohan Singh is promising to balance economic reforms with development for the poverty-stricken. He also says he will continue the peace process with

发表于:2019-01-19 / 阅读(201) / 评论(0) 分类 VOA2004(上)--国际时事

By Peter Heinlein Addis Ababa 07 February 2008 It used to be called The Club of Dictators. The African Union (AU), and before it the Organization of African Unity, lists among its alumni such infamous characters as Idi Amin, Charles Taylor, Sane Abac

发表于:2019-01-26 / 阅读(240) / 评论(0) 分类 VOA常速英语2008年(二月)

By Jim Malone Washington 28 February 2008 The war in Iraq has reemerged as a central issue in the U.S. presidential election campaign. In recent days, Republican contender John McCain and Democratic candidate Barack Obama have exchanged verbal salvos

发表于:2019-01-31 / 阅读(214) / 评论(0) 分类 VOA常速英语2008年(二月)

By Phuong Tran Nouakchott, Mauritania 13 July 2007 French engineer Jean Sahuc arrived in West Africa in the early 1950's to oversee the building of Mauritania's capital. Almost 50 years after he laid the first foundation stones in Nouakchott, Sahuc t

发表于:2019-02-01 / 阅读(223) / 评论(0) 分类 2007年VOA标准英语(七月)

U.S.A. fans are disappointed their soccer team is no longer in the World Cup. But, thanks to the U.S. team's inspiring run that has fueled interest in the tournament, they're still watching and so are soccer fans from around the world who happen to f

发表于:2019-02-12 / 阅读(204) / 评论(0) 分类 VOA标准英语2010年(七)月

By Elizabeth Lee Washington 16 October 2009 Man is transported to hospital room The U.S. Senate Finance Committee has approved a sweeping health care reform bill aimed at lowering insurance costs and expanding coverage to more Americans. In the comm

发表于:2019-02-12 / 阅读(178) / 评论(0) 分类 VOA标准英语2009年(十月)

By Phuong Tran Gaga, Chad 14 May 2007 For years, hundreds of thousands of Sudanese who fled fighting in Darfur have received shelter in refugee camps in neighboring Chad. But having survived the violence, they now face a new threat in the deadly AIDS

发表于:2019-02-17 / 阅读(403) / 评论(0) 分类 2007年VOA标准英语(五月)
学英语单词
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