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。
SVG can turn an image so it always faces the tangent of the line it is following.
SVG可以使图像转向，以便它总是面向它所移动方向的切线。
And visually what we're accomplishing is somehow to take the hyperbola, and take a point on the hyperbola, and figure out some tangent line.
从视觉上看，我们要做的是，想办法，在这个反函数，在反函数上取一个点，设法找出切线。
And that line is tangent to the surface.
一条与曲面相切的直线。
A tangent is a straight line that just touches a curve, so the concept of "running the tangents" is to run the shortest distance possible by running straight from one curve to the next.
切线是一条直线，刚好接触到曲线，所以跑切线是从一个弯道跑到另一个最短的距离。
A derivative at a given point is just the slope of the tangent line that kisses that point.
一个给定点的导数不过就是一条切线的斜率轻吻了那个点。
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？
Optimum gearing position of the mold is its alignment with the tangent of the two film-drawing wheels and with the sealing line of the transverse-sealing mold.
模具啮合的调整达到最佳位置是与两个拉膜轮之间切线及横封模具的封合线成“三点一线”。
The contact Angle is the Angle between the tangent line at the contact point and the horizontal line of the solid surface.
接触角是角之间的切线的联络点和水平线的固体表面。
The purely kinematical equation for the tangent vector of a line element is derived.
导出了线元切向量的变形方程以及拉伸轴在极射赤面投影图上位置变化计算公式。
The tangent line principle should be followed in the structure charting of garments, i. e. the places where lines link up in the structure charting should accord with the tangent principle.
服装结构制图应遵循切线原则：结构图中的线与线相连接处应符合切线的原理。
Maximum line tangent peeling to 120 square.
最大线可切线剥皮到120平方。
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。
The line connecting the point and the center bisects the included Angle of the two tangent lines.
这一点和圆心的连线平分这两条切线的夹角。
By the method of sawing and saw blade swing taking the line of saw-teeth of saw blade's working side for centre, saw blade always works toward the tangent of sawing curve.
采用锯机连同带锯条一起以带锯条工作边锯齿齿尖连线为中心作回转摆动的方法，实现带锯条始终沿着锯切曲线的切线方向进行锯切。
The steady automatic tangent line function has improved working efficiency.
稳定的自动切线功能提高了工作效率。
During digitizing, the adaptive sampling planning method based on the curvature of surface and the slope of tangent line of measured point is proposed.
在曲面数字化方面，提出基于曲面曲率和被测点切线斜率的自适应采样规划。
In this paper, a new design of tangent bridge structure was proposed, which can reduce or even avoid welding line.
本文对圆管型材制品，给出了一种切线分流桥的结构，能够减轻甚至避免圆管表面出现明显焊合线；
There are many methods to measure the circular curved line in circuitry construction survey. Angle offset method and tangent offset method are usually used.
在线路施工测量中，圆曲线测设方法有很多，通常采用偏角法或切线支距法。
A new measurement of line arrangement for river bend — deflection-tangent is presented, and its theoretical correctness is proved.
介绍了一种新的弯道放线测量方式“偏角一新切线法”，并论证了其理论上的正确性。
The procedure used to define the derivative has a geometric interpretation which leads in a natural way to the idea of a tangent line to a curve.
微分的定义步骤有一个几何解释，最简单的观念就是一条曲线的切线。
To solve the problem about determinant and solution to tangent line of curve of second order in Analytic Geometry with viewpoint and methods of Higher Geometry.
利用《高等几何》的观点、方法解决《解析几何》中的二次曲线的切线的存在性与求法问题。
The concrete expression of the unit tangent line stiffness matrix is given.
讨论了桥梁结构分析中常用单元切线刚度矩阵的具体表达形式。
The existing algorithms include equivalent left and right curve Angle by definition, normal section line method and tangent projection etc.
有关的算法有根据定义的左右曲面角相等，法截面法和切向投影等。
The new method is called welded line tangent method which forms a kinematics model for the robot operating in the bent degree based on the judgment of the tacking system.
该方法是根据焊缝跟踪系统判断焊缝的弯曲程度，确定机器人的运动学模型。
The new method is called welded line tangent method which forms a kinematics model for the robot operating in the bent degree based on the judgment of the tacking system.
该方法是根据焊缝跟踪系统判断焊缝的弯曲程度，确定机器人的运动学模型。
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