And in physics, when physicists want to say "a little bit of," delta they write lower case delta.

在物理里，他们想要表示一点点这个概念时“,常在值前面写。

麻省理工公开课 - 固态化学导论课程节选

But at the end of the day, and here's why we just went with binary and not decimal years ago, when you have one implement a computer with a physical device, it's actually really easy to represent the notion of on or off.

但是最终，之前我们采用二进制,而不是十进制，主要是因为当我们用一台实体机器运行计算机时，这实际上很容易用开或者关的概念来表示。

哈佛公开课 - 计算机科学课程节选

And so, the behaviorist manifesto would then be to develop a science without anything that's unobservable and instead use notions like stimulus and response and reinforcement and punishment and environment that refer to real world and tangible events.

因此，行为主义者的目标,是建立一门科学,将一切不可观测的事情都排除在外,取而代之的是应用,诸如刺激，反应，强化，惩罚,以及表示现实世界和客观事件的环境,之类的概念来进行研究。

耶鲁公开课 - 心理学导论课程节选

We talk in terms of high pitch and low pitch although we'll fine tune that next time, and then we have this idea of duration or time, which we tend to write out in symbols that move from your left to right.

我们是从高低方面来谈论音高,即使我们将于下次讲解曲调的问题,我们已经有了音符时值或时间的概念,我们倾向于用符号来表示,时间是从你的左边向右边移动的

耶鲁公开课 - 聆听音乐课程节选

So, the two most elementary ideas you learn are what is the average velocity of an object, as then ordered by the symbol v-bar.

你们学过的两个最基本的概念是,物体的平均速度,用"v拔"表示

耶鲁公开课 - 基础物理课程节选

So it turns out in C, you can absolutely represent the idea of a condition, a branch, a fork in the road.

结果在C语言中，你们完全可以表示出环境的概念,一个分支，一个三岔路口。

哈佛公开课 - 计算机科学课程节选

You've got to be very used to the notion of taking a vector in some oblique direction and writing it in terms of i and j.

你们应该已经很熟悉,倾斜的坐标系中矢量的概念,和用 i 和 j 来表示该矢量的方法

耶鲁公开课 - 基础物理课程节选