Call the automated line at Vector Control in Maricopa County, Arizona, and you'll get a couple of odd options.
当你给亚利桑那州马里·科帕县的病媒管制中心拨打电话，人工智能电话系统将给你列出几个奇怪的选择。
If I fix a point, then the gradient vector at that point is given to me.
确定一点，那么对我来说，这点的梯度向量就是确定的。
Vector control is the primary public health intervention for reducing malaria transmission at the community level.
病媒控制是在社区一级减少疟疾传播的首要公共卫生干预措施。
At the origin, the vector field is not defined.
在原点，向量场是没有意义的。
If you look at the vector head-on, you see a dot.
如果看到一个矢量指向你，你看到的是一个点。
It's the same vector So, a lot of vectors we'll draw starting at the origin but we don't have to.
它们是同一个向量，通常我们都选原点作为向量的起点，但是我们不一定要这么做。
We have a vector field that gives us a vector at every point.
有一个向量场来描述每一个点上的向量。
A vector image prints at the highest resolution of the printer without the jagged pixels so often seen when you zoom in on bitmaps for printing.
向量图像可以用打印机的最大分辨率打印，不会出现位图放大打印时常见的锯齿。
Well, at the time, it was just a vector.
那时候，它只是一个向量。
And, we know how to find a normal vector to this plane just by looking at the coefficients.
我们已经知道，如何根据系数找到这个平面的法向量。
Well, if I take the vector field that was in the problem set, and if I do things, say that I look at the unit circle.
如果找一个这个问题中的向量场，然后我们要做的是，假设这个单位圆。
Vector control is the main way to reduce malaria transmission at the community level.
病媒控制是在社区一级减少疟疾传播的主要途径。
If you look at the vector from behind, you see a cross.
如果矢量背对你，你看到的是一个叉。
What we will do is just, at every point along the curve, the dot product between the vector field and the normal vector.
我们要做的是，沿着曲线的每一点上，取向量场和法向量的点积。
You could say the position vector at another time, or at any time, but in fact, what's also true is that the velocity vector is in the plane.
你可以说，位置矢量在另一个时间或在任何时间，无论如何，位置矢量始终在这个平面上。
To create the mask click on the Add vector mask button at the bottom of the Layers Panel.
要创建蒙版，需点击图层面板下添加矢量蒙版按钮。
A sequence is a variable length vector that has two characteristics: a maximum size, which is determined at compile time and which could be unlimited; and a length, which is determined at run time.
序列是变长向量，它有两个特征：元素的最大大小，在编译时确定，可以是无限的；长度，在运行时确定。
Ok, so just to reinforce my warning that not every field is a gradient field, let's look again at our favorite vector field from yesterday.
好的，为了强调，不是所有场都是梯度场，我们再来看看昨天那个向量场。
And we looked at the component of a vector field in the direction that was normal to the curve.
我们研究的是，向量场在曲线法向量方向的情况。
We'll be slicing things by a plane that is now in the direction of this vector,u and we'll be looking at the slope of the slice of the graph.
用沿着向量方向的平面,切开图像,然后看图像的剖面图，找出斜率。
So, no matter how you say it, this is always zero. So, in a way, this reinforces our intuition that del, even though it's not at all an actual vector sometimes can be manipulated in the same way.
因此，无论你怎么描述它，它总是0，那么在某种程度上，这加强了我们的直觉，即▽有时也可以用同样的方式计算,即使它并不是真正的向量。
So, that's especially maybe a counter intuitive thing, but something is moving. And at that time, it's actually stopped. Now, let's see, so that's the vector. And, it's useful.
这或许看上去跟直觉不大一样，某物在移动，但在那时刻，它是静止的，现在看到，这就是那矢量，这很有用。
That means a vector that is at every point of the curve perpendicular to the curve and has length one.
也就是，曲线每一点上,垂直于曲线，模长为1的向量。
Well, at point P, the velocity vector QP is perpendicular to the line QP, 1 so the sine of that angle is one.
点P，速度向量,垂直于直线，所以该角的正弦值为。
Well, the orientation I should have for Stokes theorem is that Well, if you look at the convention around here, it tells us that the normal vector should be going this way.
对于Stokes定理中的定向——，观察这里，它的法向量应该是这个方向。
At the most basic level, it is an XML language for describing vector graphics — pictures made by drawing lines (as opposed to bitmap graphics — pictures made by drawing pixels).
在最基本的层次上，它是一种用于描述矢量图的xml语言。矢量图是由绘图线条构成的图形，与位图图形相对，后者是由绘图像素构成的图形。
This means that they can be vector based and, therefore, you can provide a common component that can be used at a variety of resolutions.
这意味着它们可以是基于矢量的，因此，您可以提供一个公共的组件，在各种不同的地方使用它。
So, what that means is that if I look at my trajectory at this point, that the acceleration vector is pointing in that direction.
这意味着如果我们在这点观察运动的轨迹，它的加速度是指向这个方向的。
So, what that means is that if I look at my trajectory at this point, that the acceleration vector is pointing in that direction.
这意味着如果我们在这点观察运动的轨迹，它的加速度是指向这个方向的。
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