数学英语 41 What are Statistics and Estimators?

by Jason Marshall Sometimes statistics* seems magical. Of course, there isnt really anything magical going onbut the fact that statistical methods can be used to pull useful information out of a hatful of messy data is, at a minimum, remarkable. And,

365个英语简短小故事-335. The Vacuum Cleaner Filter(2)

But the HEPA filter for Olivers Vibe got dirty very quickly. And, it was not cleanableit was simply replaceable. When it turned filthy brown, Oliver went back to Target to buy a new filter. Oddly, Target sold the F15 belt for the Vibe, but not the fi

365个英语简短小故事-334. The Vacuum Cleaner Filter(1)

Oliver went to Target to buy a new vacuum cleaner. The vacuum cleaners at Target cost $60 to $500. The expensive ones were too bulky and, of course, too expensive. He bought the cheapest one in the store: a Dirt Devil Vibe. Its label claimed that it

VOA慢速英语2011-Mentors Try to Improve Lives of Homeless

A mentor is someone who teaches or advises a younger person with less experience. January is National Mentoring Month in the United States. This is a time for calling attention to the value of mentoring. Some mentoring programs connect adults with ch

VOA慢速英语2011--Three Innovators Who Changed the History

EXPLORATIONS - Three Innovators Who Changed the History of Sound and Communication Technologies STEVE EMBER: Im Steve Ember. BARBARA KLEIN: And Im Barbara Klein with the VOA Special English program EXPLORATIONS. Today we tell about three inventors wh

英语语法入门：比较性副词

We can use comparative adverbs to show change or to make comparisons: 我们可以用比较性副词体现改变或比较两者的不同： I forget things more often nowadays. She began to speak more quickly. They are working harder now. We often us

数学英语 21 What are Numerators and Denominators?

图片1 图片2 by Jason Marshall In the last article, we discovered that integers alone are not sufficient to fully describe the world around uswe need the fractions existing between the integers too. (In learning that, we also learned that fraction

2007年VOA标准英语-Bhutan Welcomes Visitors, Just Not Too Many and

By Steve Herman Thimpu, Bhutan 21 May 2007 To the outside world the small Buddhist kingdom of Bhutan is regarded as a modern-day Shangri-La. Nestled along the eastern side of the Himalayas, wedged between Tibet and India, Bhutan sees few outsiders. A

闲谈英语-Receiving Visitors(3)

A: I'm really happy that you came to visit me. B: I really missed you a lot. A: I've been missing you like crazy. B: I don't understand why you haven't come to visit me. A: Lately, I've been quite busy. B: Tell me what you've been up to. A: I've real

闲谈英语-Receiving Visitors(2)

A: I'm really glad that you came to see me. B: I had to. I was missing you a lot. A: I was missing you too. B: So, why haven't you visited me? A: I've actually been busy lately. B: What have you been doing? A: I've just been working really hard. B: I

闲谈英语-Receiving Visitors(1)

A: Thanks for coming to see me today. B: It's no problem. I was really missing you anyway. A: I missed you too. B: Why haven't you tried to come see me then? A: I've been really busy. B: Doing what? A: Working. B: I would've come to see you sooner, b

地道英语对话：Visitors and Extra Tenants(1)

A: I have a question about extra people living with me in my apartment. B: You may have one roommate, but they need to have an approved application on file with us. A: What about overnight guests? B: An occasional overnight guest is not a problem. A:

地道英语对话：Visitors and Extra Tenants(2)

A: Can I have roommates in my apartment? B: You may have one roommate, but they need to pass a credit check. A: Can overnight guests stay with me? B: You may have an overnight guest, but they may not stay for an extended period of time. A: How long c

地道英语对话：Visitors and Extra Tenants(3)

A: What about roommates in my apartment? B: You may have one roommate, but their name must appear on the lease. A: Can I have someone visit me for a short period of time? B: We understand that a family member or friend may visit from time to time. Ju

VOA双语新闻 US Senators Visit Iraq

A U.S. Congressional delegation is in Iraq to meet with the country's interim government leaders and U.S. military commanders. Amid continuing violence, the senators say Iraq still needs U.S. and coalition support, and vowed to see the job through. 一

英语听力：2013-05-08 完美捕食 Perfect Predators —3

Triceratops protects itself with a bony shield called a frill. They can fend off an attacker with a pair of one-meter-long swords. Youve got to crush it. The only way to deal with this huge, curved, cantilevered, composite armor is a crushing blow wi

英语听力：2013-05-10 完美捕食 Perfect Predators —4

Its unlike any other creature that has walked the planet. T-Rex is different. Something about Tyrannosaurs and Tyrannosaurus Rex itself is different than other predatory dinosaurs. But for such a celebrated killer able to take on the toughest creatur

VOA标准英语2009年-Russia Announces Military Initiatives in Eurasi

Three international military initiatives have been announced in the Kremlin over the past two days, one of them involving an important Central Asian air base used to support U.S. military operations in Afghanistan. These developments appear to repre

2007年VOA标准英语-Nigerian Militants Announce Suspension of Attac

By Sarah Simpson Lagos 02 June 2007 One of the main militant groups operating in the Niger Delta says it will suspend hostilities for one month to allow the government of new President Umaru Yar'Adua to create a plan for peace in the oil-rich Niger D

2007年VOA标准英语-Ugandan Pastors Accused of Weakening the Fight

By Peterson Ssendi Kampala,Uganda 02 June 2007 Many Pentecostal churches in Kampala invite the afflicted to be cured. Mrs. Frances Adroa, who is HIV-positive, took them up on the offer. I am a sick person (I have HIV AIDS) so,she explains, I was prom