数学英语 20 What are Negative Numbers and Integers?

by Jason Marshall Lets kick things off with a bit of a strange question: If you were asked to walk up two stairs and then immediately back down three, how would you describe the total number of stairs youd climbed relative to where you began? Do any

TED演讲 :石油真正的代价(6)

This would put a pipeline to take natural gas 将设置天然气运输管线 from the Beaufort Sea through the heart 从波弗特海穿越 of the third largest watershed basin in the world, 世上第三大水域中心 and the only one which is 95 per

VOA慢速英语2011--Number of Foreign Students in US Continues to Rise

Education Report - Number of Foreign Students in US Continues to Rise 教育报道 - 美国国际学生数量继续攀升 中国学生数量连续两年居首位 This is the VOA Special English Education Report. 这里是美国之音慢速英语教育报

VOA标准英语2010年-Officials Warn of Ecological Disaster

Italian environmental officials are warning of an ecological disaster in Italy caused by an oil spill flowing down the Po River. They say water and bird species are at risk, as well as a fertile agricultural area. The say the oill spill has already c

2018年CRI China's second largest freshwater lake sees increasing migratory birds

Located in Hunan Province, Dongting Lake, the second largest freshwater lake in China, has witnessed an increasing number of migratory birds in recent winters. Local authorities have attributed the phenomenon to remarkable improvements in the lake's

2018年CRI Wuhan to push forward ecological protection of Yangtze River

In an effort to protect the ecological environment along the Yangtze River, officials in Hubei's capital Wuhan have taken a series of measures to regulate the wharves along shore. CRI's reporter Huang Yue has more. In late December, the average low i

科学美国人60秒 SSS African Penguins Pulled into an Ecological Trap

African Penguins Pulled into an Ecological Trap生态陷阱迷惑了可爱的企鹅 Over millions of years, penguins have evolved a keen sense of where to find food. Once theyre old enough, they set off from the shores on which they hatched for the f

数学英语 22 What Are Sequences in Math?

by Jason Marshall In the last few articles, weve talked about fractions and percentages, and soon enough well see that these ideas naturally lead us into the world of decimal numbers. But before we head down that path, lets take a quick detour to tal

数学英语 03 How to Add Negative Integers

by Jason Marshall Todays article will walk you through the first steps of kicking your calculator dependency. This isnt something we can accomplish in a single article, so well be revisiting this topic periodically. Today, were kicking things off by

数学英语 09 How to Subtract Negative Integers

by Jason Marshall In the previous article we talked about using the number line to help you keep your signs straight when adding positive and negative integers. In this article were taking things one step furthernot just adding positive and negative

British Forces Seize Oil Fields, Avert Potential Ecological

Broadcast: Mar 21, 2003 Britain's military chief says coalition forces have seized Iraq's key southern oil facilities, apparently averting what could have been a major ecological disaster. British mil

六级词汇与结构练习（27）

坚持不懈，直到成功。 我们每天的奋斗就像对参天大树的一次砍击，头几刀可能了无痕迹。每一击看似微不足道，然而，累积起来，巨树终会倒下。这恰

VOA标准英语10月-Conservationists Warn of Ecological Credit Crunch

A report by a number of leading conservation groups warns that unless prompt corrective measures are taken, the planet is heading toward an ecological credit crunch. For VOA, Tom Rivers reports from London. Cover of the Living Planet Report The repo

Severe Drought, Wildfires Threaten Water Resources

Severe Drought, Wildfires Threaten Water Resources This is Valles Caldera. Actually, it's the giant mouth of a dormant super volcano that last erupted 40,000 years ago. In the millennia since then, the terrain developed high-elevation forests, of abu

VOA标准英语2012--Ecological Footprint

Ecological Footprint Africas ecological footprint is getting bigger. The continents growing population is placing greater demand on its natural resources. A new report calls on African nations to adopt a more sustainable approach to development to en

VOA标准英语2010年-Environmentalists Seize on Gulf Oil Sp

Environmentalists protest the Gulf of Mexico oil spill in front of the White House The oil spill in the Gulf of Mexico is turning into a major ecological disaster. But the political fallout from the spill and impact on the future of offshore drilling

VOA标准英语2010年-Sierra Leone Working to Save Mangrove

Sierra Leone is working to preserve the ecosystem of coastal mangrove swamps that are threatened by people collecting firewood and harvesting salt. Harvesting salt along the coast of West Africa is an age-old business. But today conservationists say

2006年VOA标准英语-New York Marks Anniversary of World Trade Cente

By Barbara Schoetzau New York 11 September 2006 Family of Emilio 'Pete' Ortiz embrace after his name is read as families gather at the site of the World Trade Center Monday, September 11, 2006 in New York Americans across the nation paused to mark t

2006年VOA标准英语-Democrats Continue Tough Questioning of Su

By Deborah Tate Washington 11 January 2006 Senate Democrats are continuing their tough questioning of U.S. Supreme Court Nominee Samuel Alito. Abortion has been a key issue at Wednesday's confirmation

4 Ways to Measure Your Standard of Living

4 Ways to Measure Your Standard of Living Standard of living should not equate to amount of spending. When I sat down to write an article on the countries with the highest standard of living, I thought it would be easy. But, how do you define standar