CCTV9英语新闻：精英主义阻碍就业？

Each year, this is the time hundreds of thousands of soon to be college graduates begin their hunt for a dream job. Job fairs are held in quick succession and many kinds of jobs are offered. But for most graduates, the market just doesnt satisfy thei

名人演讲英语视频：最佳男主角：丹尼尔-戴-刘易斯(林肯)

演讲亮点：英国人扮演美国总统，英式幽默风笑翻全场 There is a strange thing because 3 years ago, before we decided to do a straits warp(不确定，请高手指正), I was actually commited to play Margaret Thatcher...and Meryl

CCTV9英语新闻：台湾空难致48人遇难15人受伤 两个黑匣子已找到

TransAsia Airways flight GE 222 crashed on the resort island of Penghu in Taiwan Wednesday evening, claiming the lives of 48 people, and injuring 10 others. Xi Jinping, General Secretary of the Communist Party of China Central Committee, has conveyed

CCTV9英语新闻：US wants Egyptian interim gov’t to succeed

US Secretary of State John Kerry says the United States wants Egypts interim government to succeed. At a joint press conference in Washington on Tuesday with visiting Egyptian Foreign Minister, Nabil Fahmy, Kerry called Egypts new constitution a posi

麻省理工学院公开课：单变量微积分18：微积分第二基本定理

分集介绍：介绍了微积分课程中最重要的定理微积分基本定理的形式2。仅用一点板书，就证明了这个牛顿和莱布尼茨费尽心思才发现的上帝秘密最后以几个简单的例子，给大家以最直观的理解

麻省理工学院公开课：单变量微积分23：第三次考试复习

分集介绍：数学永远不是读懂的，只有通过练习才能更好地理解数学概念和方法的本质。同样，只看视频不做题也不会收获很多。这节课上，教授总结了前一段时间的内容，带领同学们计算了

麻省理工学院公开课：单变量微积分19：定积分在对数和几何上的应用

分集介绍：在介绍了微积分基本定理的两个形式之后紧接着就是定理的应用了利用此定理，来探究一些函数的性质，让学生豁然开朗尤其是在对数函数上的应用，从前的性质竟然变得如此显然

微分方程21：卷积公式

分集介绍：这一讲引入了卷积公式f(t)*g(t)=f(u)g(t-u)du。教授从两个方面介绍了卷积的由来和用途：理论方面，卷积和拉氏变换密切相关，L(f)L(g)=L(f*g)，卷积由拉氏变换乘积关系的自然产生；实践

微分方程20：利用拉普拉斯变换求解线性常微分方程

分集介绍：这一讲的主要目标是用拉氏变换求解线性ODE，特别的，解y''+py'+qy=f(t)形式方程。为此，教授首先引入导数的拉氏变换公式，即已知y(t)经过拉氏变换得到Y(t)，那么y'及y''如何用Y(t)来表

微分方程19：拉普拉斯变换简介

分集介绍：记得幂级数吧，如1/(1-x)=(x^n)、e^x=(x^n/n!)，考虑某种变换，让两个幂级数的系数1和1/n!分别对应于f(x)=1/(1-x)或f(x)=e^x，这很容易。其实拉普拉斯变换与这是对应的。教授用这种深入浅出

微分方程17：通过傅里叶级数求特解

分集介绍：这一讲主题是利用傅里叶级数求x''+0x=f(t)的特解，其中f(t)化为傅里叶级数，通过sin和cos的可解性来求特解。这一讲采用了方波的例子，告诉我们方程的输入响应系统是如何自然选出

微分方程16：傅里叶级数简介(续)

分集介绍：这一讲是上一讲的续集，首先考虑了奇函数和偶函数两种情况，讲解了傅里叶级数在这些情况下如何简化运算（以及如果将积分简化到半个周期内）。然后将2周期延伸到了任意周期

微分方程22：利用拉普拉斯变换求解非连续输入ODE

分集介绍：这一讲主要是讲跳跃式不连续函数u(t)=1(t0); 0(t0)的情况，重新定义拉普拉斯逆变换的唯一性，即L(u(t))=1/s。之后教授讲到了函数平移之后的拉普拉斯变换如何进行，之后推广到更一般

CCTV9英语新闻：厘清失事原因 GE222黑盒子傍晚回台

The data recorded by the two black boxes onboard GE222 of Taiwan has been successfully downloaded in full. Officials from Taiwans aviation safety council said at a press conference Saturday that this is fortunate news, because both black boxes were s

CCTV9英语新闻12月：南京大屠杀76周年烛光祭举行

Some non-governmental organizations have held testimonial events in Japan about the Nanjing Massacre, to reveal the atrocity to the Japanese people. Survivors have been invited to personally recount their ordeals. Iain McKinnell has the details. Mass

CCTV9英语新闻：数十亿美元注入计程车呼叫程序的战斗

Starting this January, Chinas market in taxi hailing apps has become a battlefield between two mobile apps, Didi and Kuaidi. The competition between the two apps is backed by two of Chinas largest internet companies, Tencent and Alibaba. Both apps la

英语新闻视频：中国南方多地遭遇强降雨袭击

Heavy rainfall has hit several major cities and provinces in Southern China. The weather has caused flooding and severe weather warnings in the Guangxi Zhuang Autonomous Region. And it looks set to continue for the next couple days. In Yitang village

CCTV9英语新闻：草莓音乐节将各路人才带到北京

The May Day break gave people a rest from work, but also an opportunity to revel in some live music at the annual Strawberry Music Festival in Beijing. With eight stages and hundreds of acts, Strawberry had something for everyone, ranging from old-sc

英语新闻视频：韩式结婚照受香港年轻人广泛的青睐

Despite the downturn in the global economy, wedding planners and photographers say theyve never been busier. At this years wedding expo in Hong Kong, people are planning for one of the most important days of their lives. And the hottest ideas have a

OMG!美语 Head Over Heels

1) head over heels 很爱一个人,为他神魂颠倒 2) wear your heart on your sleeve 感情外露 3) big heart 热情大方