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(270) / 评论(0) 分类 麻省理工学院公开课:单变量微积分

Fitness Bands Fail on Calorie Counts健身手环并不能准确计算卡路里 Fitness bands like the Apple Watch and the Fitbit aim to track your vitals, like heart rate. But early models weren't all that accurate.We thought of them a little bit lik

发表于:2018-12-24 / 阅读(59) / 评论(0) 分类 2017年科学美国人(五)月

I: Boris, look at this sentence.Healthy eating is not about strict nutrition philosophies, staying unrealistically thin, or depriving yourself of foods you love. It's interesting, isn't it? B: I'd rather say it's confusing. what are those strict nutr

发表于:2018-12-25 / 阅读(93) / 评论(0) 分类 和老外聊天地道口语

Despite all this, Dr Dave doesn't think much of this contribution to computing history. 尽管有这一切的原由,Dave博士并不觉得他这项在计算机发展史上极有贡献的发明有多了不起。 学习重点: 1.think much of 推崇

发表于:2018-12-25 / 阅读(94) / 评论(0) 分类 留美老师带你每日说英文

They are important to us because they are important to our customers, who depend on them for the most demanding, business-critical computing. 这些产品对我们非常重要,因为它们对我们的客户很重要,我们的客户正依赖它们完

发表于:2019-01-18 / 阅读(58) / 评论(0) 分类 财富精英励志演讲

In this environment, Compaq determined that we needed to do more for our customers. 在这种市场环境里,康柏决心要为我们的客户做更多的事情。 We wanted to take the attributes that had made us successful - industry standard pla

发表于:2019-01-18 / 阅读(57) / 评论(0) 分类 财富精英励志演讲

So we started asking ourselves: What kind of less obvious metrics could we use to actually evaluate our employees' sense of meaning, or our customers' sense of emotional connection with us? For example, we actually started asking our employees, do th

发表于:2019-01-18 / 阅读(67) / 评论(0) 分类 财富精英励志演讲

I took one psychology class in college, and I learned about this guy, Abraham Maslow, as many of us are familiar with his hierarchy of needs. But as I sat there for four hours, the full afternoon, reading Maslow, I recognized something that is true o

发表于:2019-01-18 / 阅读(97) / 评论(0) 分类 财富精英励志演讲

What counts for Vivian was the emotional connection she created with her fellow employees and our guests. And what gave her inspiration and meaning was the fact that she was taking care of people who were far away from home. Because Vivian knew what

发表于:2019-01-18 / 阅读(69) / 评论(0) 分类 财富精英励志演讲

This is Dave Arringdale who's actually been a longtime guest at Vivian's motel. He stayed there a hundred times in the last 20 years, and he's loyal to the property because of the relationship that Vivian and her fellow employees have created with hi

发表于:2019-01-18 / 阅读(75) / 评论(0) 分类 财富精英励志演讲

I've taken that Robert Kennedy quote, and I've turned it into a new balance sheet for just a moment here. This is a collection of things that Robert Kennedy said in that quote. GDP counts everything from air pollution to the destruction of our redwoo

发表于:2019-01-18 / 阅读(61) / 评论(0) 分类 财富精英励志演讲

at 19XX price 按一九XX年价格计算 at a discount 按赔价计算;按贴水价格计算;打折扣 at a premium 按溢价计算;按升水价格计算 at call 通知付款;按通知 at

发表于:2019-02-01 / 阅读(77) / 评论(0) 分类 财会英语

Full coverage: 6.5-Magnitude Quake Hits Southwest China's Yunnan Surveillance video footage shows the moment the quake hit. This is at a pedestrian street at a square in Ludian County. In another region, people ran to the street after the quake hit.

发表于:2019-02-05 / 阅读(92) / 评论(0) 分类 CCTV9英语新闻2014年08月

Dogs do have much shorter life spans than we humans do. In an attempt to gauge our pets stage in life in a way we can relate to, we often use the popular myth of multiplying their age by seven. One problem with the formula is that it doesnt consider

发表于:2019-03-06 / 阅读(104) / 评论(0) 分类 英语时差8,16