In Key West, a sign on a monument says "America Begins Here."

VOA: special.2010.03.22

And I've reversed the fraction here because of the negative sign here.

我交换了分子和分母,因为这里有个负号。

麻省理工公开课 - 热力学与动力学课程节选

Here you just sign up if you want to go.

在这儿，想参军你就报名。

关于美军 - SpeakingMax英语口语达人

The sign says "America Begins Here."

VOA: special.2010.03.22

Convention, OK, this negative sign is just a pure convention. You just got to use it all the time. If you use an old textbook, written when I was taking thermodynamics, they have the opposite convention, and it's very confusing. But now we've all agreed on this convention, and work is going to be with the negative sign here.

系统对外界做功的符号为负,这就是我们,在本课中的规定，纯粹出于统一符号的需要，有些教科书中，可能会使用相反的符号规定,注意不要混淆了，这门课上,我们将一直使用。

麻省理工公开课 - 热力学与动力学课程节选

You'll also know that all of these binding energies here are negative, so the negative sign indicates that it's low.

你们将会知道所有的这些,结合能都是负的。

麻省理工公开课 - 化学原理课程节选

And if any of you here are nodding in agreement at these sentiments, that's not such a good sign.

如果在座有同学,点头同意这些人的观点，这可不是一个好迹象。

耶鲁公开课 - 心理学导论课程节选

Or I'm canceling the 5 everywhere and changing the sign here I get t^-2t-3=0.

或者我在等号两边除以5,并变号得到t^-2t-3=0

耶鲁公开课 - 基础物理课程节选

So you may take this course ultimately via pass-fail or letter grade and I am more than happy to chat with you about the implications and to sign any paper work such as the stack here that you might need.

你可能希望这门课采用及格-不及格分制或者分数制,我很乐意跟你聊下,两个打分制各自的含义,也可以帮你在这里签到。

哈佛公开课 - 计算机科学课程节选

I'm not sure whether we'll use the Classes server to have you sign up for discussion sections online, or whether we will do it the old-fashioned way and have you sign up on forms that we'll give you here in class.

我还没想要是用校网站,让大家在线讨论，还是用传统的,课堂讨论。

耶鲁公开课 - 新约课程节选

You always want to check your signs at the and because it's so easy to get the sign wrong, and I was hoping that it was right here because I wasn't sure, but it turned out to be right.

我们完成计算时，一定要记得检查符号,因为很容易弄错符号，刚才我就不太确定,是否弄错了符号，检查发现没有问题。

麻省理工公开课 - 热力学与动力学课程节选

Another way to say that it's going to be less, so you don't get confused with that the fact this is in the numerator here, there is that negative sign so it's less energy but it's a bigger negative number that gives us that less energy there.

另一个方式去说它将会变得很低实用，你们不用在这里的计算器的事实感到迷惑,这里有一个负号实用，它是更少的能量,但它是一个更大的数字,这里了它给了我们更少的能量。

麻省理工公开课 - 化学原理课程节选

One thing that makes it pretty clear is that certainly delta S or the sign of it alone is not dictating the outcome here.

这个例子非常清楚的说明,熵增dS或者它的符号,不能单独决定最后的结果。

麻省理工公开课 - 热力学与动力学课程节选

No, we call that work positive work. All right, so that means we need to put a negative sign right here, by convention.

历史上有过不同的习惯，这里我们规定,如果环境对系统做功。

麻省理工公开课 - 热力学与动力学课程节选

Infinity is the force when we're thinking about it and our brains, negative infinity is when we actually plug it into the equation here, and the reason is the convention that the negative sign is just telling us the direction that the force is coming together instead of pushing apart.

说力有多大时，我们想到的,是无穷大，而方程解出来的,是负无穷，这是因为习惯上,我们用负号表示力的方向,是相互吸引而不是相互排斥的,所以我们可以用库仑定律。

麻省理工公开课 - 化学原理课程节选

You got to understand what the minus sign is doing here.

你们要明白负号在这个式子中的意义

耶鲁公开课 - 基础物理课程节选

So I changed the colors here to show that these are 2 p orbitals with an opposite phase or an opposite sign.

我这里换了一种颜色,表示2p轨道,不同的相位或者是正负号。

麻省理工公开课 - 化学原理课程节选