所以，我们要怎么找，垂直于这个平面的向量？
So, how do we find this vector that's perpendicular to the plane?
所以这个外积还是垂直于同一个平面。
为啥呢？呃，就是说，我们知道，怎么画垂直于这个平面的向量。
Why is that? Well, let's say that we know how to find a vector that's perpendicular to our plane.
首先我们从名字上开始分析，所谓“法线”指的是垂直于平面的向量，我们使用这个来计算光照。
Let's break the name down. The "normal" is a vector perpendicular to a surface, which we can use to calculate lighting.
如果它垂直于这个平面，在那个例子里，它垂直于黑板。
Now, if it's perpendicular to the plane, then in that case, it's perpendicular to the blackboard.
这个效应表明，有一种垂直于圈平面的力作用在磁极上。
The effect is that of a force, perpendicular to the plane, acting on the magnetic pole .
这个效应表明，有一种垂直于圈平面的力作用在磁极上。
The action of the negative pole of a magnetic needle is just as real as the action of the positive pole .
这个效应表明，有一种垂直于圈平面的力作用在磁极上。
The action of the negative pole of a magnetic needle is just as real as the action of the positive pole .
应用推荐