At first it meant hitting a spot at the center of a target with an arrow.

VOA: special.2009.09.20

Some people like to use an arrow, and the arrow points in the direction of the more electronegative end.

也可以用箭头，箭头指向,带负电的一极。

麻省理工公开课 - 固态化学导论课程节选

Instead if we want this pointer to represent the address of something in as much as it points at that address let's just draw an arrow.

如果我们想要让这个指针表示,数据的地址，它指向的地址,我用一个箭头表示。

哈佛公开课 - 计算机科学课程节选

The proper way to draw a vector is to draw an arrow that's got a beginning and it's got an end.

画矢量的正确方法是,画一个有起点和终点的箭头

耶鲁公开课 - 基础物理课程节选

So if I get rid of these arrows, there's no heat flowing because they're in thermal equilibrium, then I can't have an arrow here.

所以如果我擦去这些箭头，没有热流存在,因为它们处于热平衡，那么这里也不能存在一个箭头。

麻省理工公开课 - 热力学与动力学课程节选

But since in drawing Lewis structures actually, in some cases you do, you can draw a dotted line that means a 1 and 1/2 bond, but most in most cases, we just draw out both resonance structures, and the way that we say it's a resonance structure is that we put it in the brackets and we put an arrow between it.

但是由于在画路易斯结构时,其实，在某些情况下是可以的，你可以画一条虚线来表示一又二分之一键，但是在多数情况下，我们就把两个结构都画出来，而我们说这是一个共振结构的表示的方法是,把它们放在括号里，并在中间放一个双箭头。

麻省理工公开课 - 化学原理课程节选

If you want to talk about an arrow of any kind, you've got to put a little arrow on top of it.

如果你问要画什么箭头,只要在上面画个小小的箭头就行

耶鲁公开课 - 基础物理课程节选

The picture is more compelling with an arrow at this point.

在这里这张图中的箭头是扣人心弦的。

哈佛公开课 - 计算机科学课程节选

When I draw something without an arrow, I'm talking about the magnitude.

如果我写下的字母没有箭头,那就说明我在讨论模长

耶鲁公开课 - 基础物理课程节选

Let's just assume that s1 is a pointer and as an arrow suggests it's pointing at this byte here.

我们假设s1是一个指针,就像箭头所表示的，指向这个字节。

哈佛公开课 - 计算机科学课程节选

An arrow to the same thing, right?

一个箭头指向同一东西，对不？

哈佛公开课 - 计算机科学课程节选

So, for the most part any time we talk about or draw pointers an arrow suffices, which really 71 in there is a number like 71, which is the literal byte that the F is actually in in RAM, but frankly who cares?

所以，每次我们讨论,或者用箭头表示指针,在指针里面有一个数字，如,那是F在RAM中的字节，但是谁在乎它呢？

哈佛公开课 - 计算机科学课程节选

If you don't put an arrow on top, it means you're talking about just a number A.

如果不加这个小箭头,也就意味着你只是在讨论一个数字 A

耶鲁公开课 - 基础物理课程节选

That's why we don't have an arrow here, because we could go back, this way too.

这就是为什么我们这里没有用箭头的原因，因为我们可以过渡回去，像这样。

麻省理工公开课 - 热力学与动力学课程节选

Then, you make an arrow corresponding to B and lay it on the end of this one.

再画一个表示 B 的箭头,把 B 放在 A 的终点

耶鲁公开课 - 基础物理课程节选

The typical vector is called V or A or B something with an arrow on it.

表示矢量时一般在,字母 V,A 或者 B,上面加个箭头

耶鲁公开课 - 基础物理课程节选

You can either think of it as an arrow and imagine the arrow, or you can reduce it to a pair of numbers, x and y.

你既可以用有向线段来表示,也可以用一组数字来表示,x 和 y

耶鲁公开课 - 基础物理课程节选

I write it without an arrow here.

在这里我用不带箭头的 a 写出来

耶鲁公开课 - 基础物理课程节选

Pick any two perpendicular directions Then the same entity, the same arrow which has an existence of its own, independent of axis, can be described by you and me using different numbers.

选取两个互相垂直的方向,这样同样的物体,同一矢量,并且是独立于坐标轴而存在的,可以被你和我用不同的数字来描述

耶鲁公开课 - 基础物理课程节选