This vector is called a normal vector or normal for short.
这一向量就称为法线向量或简称为法线。
就是这个矢量。
So, this vector field is not conservative.
所以，这个向量场不是保守场。
向量BP是什么？
Now, how do we get this unit vector?
那我们怎么得到这单位矢量呢？
Then, if I choose any vector in that tangent plane.
那么如果我选择了任何位于切平面的向量。
Add the access point to your location vector.
将访问点添加到位置向量中。
Vector control measures are also being implemented.
病媒控制措施也正在得到实施。
That was a vector field in the plane.
它是一个在平面上的向量场。
Of course, it's not a real vector.
显然，这不是一个实际意义上的向量。
它不是单位向量。
All of the important vector species bite at night.
所有这些主要病媒按蚊均在夜间叮咬。
I want to find the potential for this vector field.
我想找出这个向量场的势函数。
And let's try a really big vector.
让我们试试更大的向量值。
So I start with this vector, that’s already here.
我从这个向量开始，它已经在这边了。
So, vector BP, we know two things about it.
向量BP，我们知道关于它的两件事。
So, that means this actually should be the unit vector.
这意味着这一项就是单位向量。
We all have seen... this is a vector.
我们都见过…这就是矢量。
So, in fact, it's a vector field.
事实上，是一个向量场。
Therefore, a concept of path is fundamental to vector drawings.
因此，路径的概念对矢量作图非常重要。
The next thing to play with is vector graphics.
接下来要处理的是矢量图形。
The problem is not every vector field is a gradient.
问题是，不是所有向量场都是梯度。
Well, at the time, it was just a vector.
那时候，它只是一个向量。
OK, that's what we call the velocity vector.
就是我们所说的速度矢量。
Let's say that our vector field has two components.
假设我们的向量场有两个分量。
Well, our vector field, is actually vertical.
向量场是竖直的。
In fact, vector control is the one and only preventive measure.
事实上，病媒控制是唯一的预防措施。
It's the unit vector in the vertical direction.
即竖直方向的单位向量。
Vector control is by far our most important tool for preventing malaria.
病媒控制是迄今为止我们预防疟疾的最重要工具。
Other control activities include assistance with vector control and health promotion.
其它控制活动包括帮助开展媒介控制和健康促进。
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