1·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。
2·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。
3·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？
4·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。
5·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。