分集介绍:尽管之前学习过如何处理极限了,但是对于一些特殊情形的极限问题,过去的方法显得有点苍白。在先前课程的内容铺垫下,我们终于可以处理一些不定型的极限问题了,其中包括

发表于:2018-12-09 / 阅读(289) / 评论(0) 分类 麻省理工学院公开课:单变量微积分

Critics Say Venezuelan Protests Test Limits of Military's Support 批评家称委内瑞拉抗议考验军方支持极限 During the two months of deadly anti-government protests that have rocked the oil-rich nation of Venezuela, President Nicolas Mad

发表于:2018-12-16 / 阅读(62) / 评论(0) 分类 VOA标准英语2014年(四月)

Dialogue: 大明: 何亚君,今天我们以5小时16分58秒的净时间完成了你的首个全程马拉松,感觉怎么样? 何亚君:非常兴奋, 再你们的帮助下,我终于完成了我的马拉松之梦,这让我看到了光明!感

发表于:2018-12-28 / 阅读(50) / 评论(0) 分类 英语PK台

During times of drought, animals are stressed to the limit. 在干旱时期,动物们的压力已至极限。 Normal behavior is basically thrown out the window and it becomes a no holds bar fight for survival. 通常的行为都已不再适用,这

发表于:2018-12-28 / 阅读(52) / 评论(0) 分类 侏罗纪搏击俱乐部

本期看点:6位风格迥异的选手,今晚你会爱上谁呢?比赛现在开始了,盛大的音乐盛宴将带来震撼,你准备好了吗?他们会为你带来惊喜的。更多精彩不容错过

发表于:2019-01-05 / 阅读(39) / 评论(0) 分类 美国偶像 第十三季

[全屏观看] 点击右键- 另存为 可保存这个Flash影片 游戏说明: 游戏介绍:史酷比用托盘接住主人从冰箱中抛出的食物,盘中的食物越高可越容易打翻哦! 操作指南:方向键;左、右,空格键:吹气

发表于:2019-01-08 / 阅读(154) / 评论(0) 分类 英语操作敏捷小游戏

Its reputation for violence and terror is unmatched, but an infant T-Rex comes into the world better protected than most. If you say Tyrannosaurus Rex, I think of gentleness. I think of superb motherhood and a struggle to raise ones chicks. The dread

发表于:2019-01-23 / 阅读(47) / 评论(0) 分类 探索与发现2013年

In a world of terrifying creatures, being small means facing danger at every turn. If you were a small animal, the late cretaceous would have been an awful time to be around. For a youngster, every day is a struggle to stay alive. Their only chance i

发表于:2019-01-23 / 阅读(63) / 评论(0) 分类 探索与发现2013年

It is Now it's your turn to contribute, to lead and to find your way. 确实是这样现在轮到你们来贡献 来领导 来找到前进的道路 The good news is you're also the most capable generation ever You're better educated, you have a more

发表于:2019-02-16 / 阅读(57) / 评论(0) 分类 公众人物毕业演讲

Bulls down one 公牛落后一分 Crowd gets quiet 观众鸦雀无声 The moment starts to become the moment, you know, for me 千钧一发,气氛开始变得紧张,这是属于我的时刻 Once you get in the moment, you know you're there and 你会

发表于:2019-02-19 / 阅读(70) / 评论(0) 分类 篮球英文堂

Doubt 质疑 Isn't the storm 不是暴雨 Doubt 质疑 Is the drizzle 是毛毛细雨 Just enough to make you stay inside 让我审视自己的内心 Second guess yourself 怀疑自己 Or quit 或者逃避 Or let them have it 或者拱手相让 Or qu

发表于:2019-02-19 / 阅读(54) / 评论(0) 分类 篮球英文堂