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麻省理工学院公开课：单变量微积分27：参数方程、弧长和表面积

分集介绍：积分的概念来源于实际的应用。对一个函数积分可以理解为求曲线下的面积，但积分的作用不仅仅如此。有了积分，我们就可以去计算曲线的弧长，可以去求区域的面积， 也可以去

发表于:2018-12-09 / 阅读(269) / 评论(0) 分类 麻省理工学院公开课：单变量微积分

VOA双语新闻：以巴吁欧对中东和平发挥更大作用

Palestinian and Israeli leaders have declared their commitment to peace before a Mediterranean summit in Paris. Both sides have called for Europe to play a bigger role in the Middle East peace process. 巴勒斯坦和以色列的领导人在巴黎的地

发表于:2018-12-19 / 阅读(56) / 评论(0) 分类 VOA双语新闻 2008年7月

Daily English-2016年07月02日

Whatever is worth doing is worth doing well . 任何值得做的事就值得把它做好！ 图片1

发表于:2018-12-20 / 阅读(45) / 评论(0) 分类 Daily English-2016.07

Daily English-2015年07月08日

Not everything is meant to be. But everything is worth a try. 不是所有事情都能如愿以偿，但是任何事情都值得尝试。 图片1

发表于:2018-12-20 / 阅读(55) / 评论(0) 分类 Daily English-2015.7

VOA慢速英语2014 Breast Cancer Drug Fights Infection in HIV/AIDS Patients 一种乳腺癌药物对艾滋病病毒也有一定的抗感染作用

Breast Cancer Drug Fights Infection in HIV/AIDS Patients 一种乳腺癌药物对艾滋病病毒也有一定的抗感染作用 From VOA Learning English, this is Science in the News. Im Faith Lapidus. And Im Steve Ember. Today on the program, we tell

发表于:2019-01-12 / 阅读(132) / 评论(0) 分类 2014年VOA慢速英语(三)月

VOA常速英语2014--越希望美在解决与中争端上发挥更大作用

Vietnam Wants Larger US Role in Dispute With China 越希望美在解决与中争端上发挥更大作用 STATE DEPARTMENT Vietnam wants the United States to play a bigger role in settling territorial disputes with China. Washington is refusing, thou

发表于:2019-01-14 / 阅读(79) / 评论(0) 分类 VOA标准英语2014年(六月)

VOA标准英语2013--分析学家:法院对于美国监控项目的判决不会起根本作用

Analyst: Court Ruling Will Not Radically Impact US Surveillance 分析学家:法院对于美国监控项目的判决不会起根本作用 The U.S. security surveillance program and a former government contractor who leaked details about it are in the

发表于:2019-01-31 / 阅读(72) / 评论(0) 分类 VOA常速英语2013年(十二月)

VOA常速英语2013--热浪期的协同作用导致城市酷热

Heat Waves Make Cities Swelter Synergistically 热浪期的协同作用导致城市酷热 No wonder its gonna be a hot time in the old town tonight. Cities can be anywhere from two to 20 degrees Fahrenheit hotter than nearby countryside, due to whats

发表于:2019-02-01 / 阅读(66) / 评论(0) 分类 VOA常速英语2013年(九月)

VOA双语新闻：美国总统候选人辩论的历史和作用

On Friday, presidential candidates Barack Obama and John McCain are scheduled to hold the first of three debates ahead of November's election. Presidential debates have often played a crucial role in U.S. election campaigns in the past. 美国总统候

发表于:2019-02-14 / 阅读(62) / 评论(0) 分类 VOA双语新闻 2008年9月

VOA双语新闻 - 佩林在共和党内未来作用引人关注

Following Democrat Barack Obama's victory in last week's presidential election, Republicans have begun a period of self-reflection about what went wrong and how to improve their prospects in the future. Any discussion of the party's future has to inc

发表于:2019-02-14 / 阅读(53) / 评论(0) 分类 VOA双语新闻 2008年11月

英语听力文摘 English Digest 80、手势的作用

Communicating by voice alone has its drawbacks, though.For example, I cant use hand gestures to clarify what I mean. And, as it turns out, that makes a big difference. Researchers at the University of Otago in New Zealand wanted to know how much a re

发表于:2019-02-16 / 阅读(50) / 评论(0) 分类 英语听力文摘 English Digest
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