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。
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。
就是这个矢量。
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。
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。
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。
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