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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(263) / 评论(0) 分类 麻省理工学院公开课：单变量微积分

美国有线新闻 CNN 夏威夷火山熔岩切断公路 烟雾笼罩周边区域

First today on CNN 10, a special weather statement for part of Hawaii. It's not rain. It's not storms. It's ashfall from the erupting Kilauea volcano that's likely in the southern part of Hawaii's big island. 今天CNN10分钟新闻首先来关注夏威

发表于:2018-12-20 / 阅读(49) / 评论(0) 分类 CNN美国有线新闻2018年7月

VOA常速英语2013--叙利亚暴发脊髓灰质炎引发区域传播恐惧

Polio Outbreak in Syria Prompts Fears of Regional Spread 叙利亚暴发脊髓灰质炎引发区域传播恐惧 LONDON An outbreak of polio among children in Syria has the potential to spread rapidly, doctors are warning. It is Syrias first polio out

发表于:2019-01-03 / 阅读(52) / 评论(0) 分类 VOA常速英语2013年(十一月)

VOA标准英语2014--埃博拉感染区域图或能帮助阻止未来爆发

Ebola Map May Help Stop Future Outbreaks 埃博拉感染区域图或能帮助阻止未来爆发 Oxford University scientists have developed a map of areas where animals are likely to be infected with the Ebola virus and they say its a first step towa

发表于:2019-01-14 / 阅读(61) / 评论(0) 分类 VOA标准英语2014年(九月)

VOA标准英语2015--区域冲突和气候影响食品安全

Conflict, Climate Affect Food Security 区域冲突和气候影响食品安全 A new report says there were both advances and setbacks in food security in 2014. Poverty was reduced last year and the number of hungry people declined. However, conflict

发表于:2019-01-14 / 阅读(48) / 评论(0) 分类 VOA标准英语2015年(三月)

英语听力文摘 English Digest 499、教育孩子影响大脑？

How Parenting Affects the Brain 教育孩子影响大脑 If youre one of those parents that constantly worries about their kids, youre not alone. In fact, a study out of Yale University suggested that having a child may actually affect your brain fun

发表于:2019-01-26 / 阅读(51) / 评论(0) 分类 英语听力文摘 English Digest

VOA标准英语2013--世界银行区域健康报告

World Bank Issues Regional Health Reports 世界银行区域健康报告 The World Bank has released new reports outlining the health challenges facing six major regions. Those challenges include not only many types of disease, but road accidents as

发表于:2019-02-01 / 阅读(38) / 评论(0) 分类 VOA常速英语2013年(九月)
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