That vector is called a "null vector".
那种矢量就叫做”零矢量“。
An expressing vector of major outer-membrane protein of Chlamydia psittaci was constructed.
构建了鹦鹉热衣原体主要外膜蛋白的表达载体。
This research intended to construct a eukaryotic expression vector with a site-directed mutation of porcine MSTN propeptide gene.
本研究旨在构建具有猪 MSTN 前肽基因定点突变的真核表达载体。
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。
Well, the first observation is that the velocity vector what can I say about the velocity vector of this motion?
首先，第一个观察到的就是速度向量,关于这个运动中的速度向量，我可以说点什么呢？
So, this vector field is not conservative.
所以，这个向量场不是保守场。
Now, how do we get this unit vector?
那我们怎么得到这单位矢量呢？
We dot our favorite vector field with it.
用我们喜欢的向量场来点乘它。
We would like to have the option of initializing an infinite random vector with the values in another vector.
希望能够用另一个向量中的值对一个无限随机向量进行初始化。
Does the gradient vector, why is the gradient vector perpendicular in one direction rather than the other?
梯度向量的垂直方向，为什么是这样而不是另外一个方向？
就是这个矢量。
And, the direction is essentially that of a vector.
方向基本和这里的单位切向量一致。
Well, you know the normal vector.
那么当然知道它的法向量。
The key to understanding this all is vector arithmetic.
理解这一切的关键在于向量算术。
That corresponds to normal vector pointing up.
那相当于法向量指向上。
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。
Add the access point to your location vector.
将访问点添加到位置向量中。
That was a vector field in the plane.
它是一个在平面上的向量场。
它构成一个矢量。
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。
These involve vector quantities.
这些则包括向量。
那么法向量又是什么呢？
Vector constants are created by putting the type of vector in parentheses followed by the contents of the vector in curly braces.
向量常量的创建方法如下：先是在圆括号中的向量类型，然后是使用花括号括起来的向量内容。
Now, what's the gradient vector?
现在，梯度向量是什么呢？
In fact, our vector field and our normal vector are parallel to each other.
事实上，给定的向量场与法向量是相互平行的。
And we have learned how to package partial derivatives into a vector, the gradient vector.
我们也知道了，如何将各个偏导组合成一个梯度向量。
In machine learning, the data is often represented as a vector, sometimes called a feature vector.
在机器学习中，数据通常被表示为矢量，有时也称作特征矢量。
I experience a vector quantity.
我经历了一个矢量的量变。
Why else would you know a normal vector?
还有什么原因你会知道法向量？
Vector control measures are also being implemented.
病媒控制措施也正在得到实施。
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