And that line is tangent to the surface.
一条与曲面相切的直线。
The direction is tangent to the trajectory.
方向就是轨道的切线方向。
It's going to be tangent to the level surface, right?
它是与等值面相切的，对不对？
As light passes tangent to your form you have core shadows.
当光线和你的物体相切时得到一个核心影子。
So, the velocity vector is going to be always tangent to the curve.
速度向量总是与曲线相切的。
I wish I was your derivative so I could lie tangent to your curves.
我希望我是你的导数，这样我就能成为一条切线，躺在你的曲线上。
But, actually, that is not true because here the circle is tangent to the axis.
但实际上，这是不对的，因为这个圆与这个坐标轴相切。
The plane that contains all the lines tangent to a specific point on a surface.
包含所有在表面上的一个特殊的点相切的线的平面。
They are just flowing along the circle around and around so the flux will be zero. F now is tangent to c.
只是沿着曲线流动，所以通量为零，F与C相切。
Departure Angle: back-end automotive primer highlights the tangent to the rear of the Angle with the ground.
离去角：汽车后端突出点向后轮引的切线与地面的夹角。
An algorithm for constructing rational spline closed curve which is tangent to the given polygon is described.
描述了一种与给定多边形相切的有理样条曲线的算法。
And now, delta r should be essentially roughly equal to, well, its direction will be tangent to the trajectory.
这里，△r应该是近似等于。。。,它的方向是轨道的切线方向。
If you remember what we did several times, well, along the circle that vector field now is tangent to the circle.
我们做过若干次了，沿着圆，向量场与圆相切。
The other way to think about it, the direction in which the value doesn't change is a direction that's tangent to the level surface.
另一种方法是，函数值不变的方向是,是与等值面相切的方向。
Under loads, a rigid body and the surrounding soil will change relatively their positions normal to or tangent to the faces of the rigid body.
由于刚体不可变形，这些相对位移只能通过土体的法向和切向变位来实现。
We know that the gradient is perpendicular to this vector that's tangent to the level surface What about other vectors tangent to the level surface?
我们知道梯度向量垂直于这个向量，而速度向量是相切于等值面的，其他相切于等值面的向量，又如何呢？
That means that you want to pick, ultimately, a point on this — this line is tangent to the efficient portfolio frontier with all the other assets in it.
那意味着你会最终会在这上面选一个点-，这条直线是与有效边界相切的，后者包含了所有的资产组合。
Now, if I have two lines tangent to the surface, well, then together they determine for me the tangent plane to the surface. Let's try to see how that works.
现在，假设曲面上有两条相交切线，那么这两条切线可以确定一个切平面，我们来看看这个平面是怎么搞出来的。
The green spiral is made from quarter-circles tangent to the interior of each square, while the red spiral is a Golden spiral, a special type of logarithmic spiral.
绿色螺旋线由内部每一个正方形和四分之一圆相切线构成，而红色的螺旋线是黄金螺旋线，它是对数螺旋线的一种特殊类型。
Based on shearing stress Theorem, we know that the shearing stress direction of all the spots on the edge of circular cross-section should be tangent to the circle.
由切应力互等定理可知，在截面边缘上各点处切应力方向必与圆周相切。
That is a vector field in which the trajectories are going to be circles centered in the z-axis and our vector field is just going to be tangent to each of these circles.
这是一个向量场，其中旋转轨道是，以z轴为圆心的圆周，并且这个向量场与每个圆相切。
If the two level curves are tangent to each other that means they have the same tangent line. That means that the normal vectors should be parallel. Let me maybe draw a picture here.
如果两个等高线相切，说明它们的切线相同，也就是说他们的法向量应该平行，我再在这里画个图。
The access is tangent to the curve and the Spaces refer to the interior, while the "public space" of the living room, being transparent, sees outside with a view to the thicket.
访问是相切的曲线和空间是指内地，而“公共空间的客厅”，是透明的，看到外面的灌木丛，以查看。
The wedge angle bisector gives as intersection with the cutting edge profile point pint. (3) Draw a circle that intersects point pint and is tangent to both straight fitting lines.
这楔角的等分线给作为路口停止切割边缘轮廓点品脱的啤酒。 （3）画一个圆订交点，两品脱和相切直线拟合直线。
Some examples are given by inscribed and circumscribed circles of polygons, lines intersecting and tangent to conic sections, the Pappus and Menelaus configurations of points and lines.
一些例子所给予者和限制各界的多边形，线相交和相切的圆锥部分，帕普斯和墨涅拉俄斯配置的点和线。
In particular, an easy case where you know you can get away without computing anything is, of course, if your vector field is tangent to the surface because then you know that there is no flux.
特别地，有一种简单的情况，是不用计算的，当向量场与曲面相切，没有通量。
And, in some cases, for example, if you know that the vector field is tangent to the curve or if a dot product is constant or things like that then that might actually give you a very easy answer.
例如，在某些情况下，如果已知向量场与曲线相切，或者内积是一个常数等等，那么结果将会很简单。
And, in some cases, for example, if you know that the vector field is tangent to the curve or if a dot product is constant or things like that then that might actually give you a very easy answer.
例如，在某些情况下，如果已知向量场与曲线相切，或者内积是一个常数等等，那么结果将会很简单。
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