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？
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。
That's one way to define the tangent plane.
这是定义切平面的方法。
Let's think about the tangent plane with regard to a function f.
我们来考虑，关于函数f的一个切平面。
Tangent measures can be used to describe the local behavior of a measure.
切测度可用来刻画一个测度的局部性态。
Do I need to draw a tangent line of this circle?
我需要画出这个圆的一条切线吗？
To achieve tangent option you will have to build the surface in parts.
为了实现切线选项，您将必须建设中的表面部分。
To achieve tangent option you will have to build the surface in parts.
为了实现切线选项，您将必须建设中的表面部分。
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