1)  tangent
切线段
1.
Based on the basic geometrical fact that the sum length of the two tangents from a point outside a circularity to it is larger than the arc between the tangents, we can draw the same conclusion if we replace the arc with a protruding slick curve.
本文从一个初等几何事实 (从圆外一点向圆引两条切段 ,则这两条切线段的长度之和大于它们所夹的圆弧。
2)  tangent
切线
1.
A Tangent-based Algorithm to Line Fitting for Curves in Vectorization;
一种基于切线的曲线直线拟合的矢量化算法
2.
Property of parabola about tangent and its application in construction;
抛物线关于切线的性质及其在作图中的应用
3)  tangent line
切线
1.
In order to facilitate maintenance and cut the cost,the vertical pump is changed to horizontal pump and the tangent line and the slit of slide residue defects are corrected.
漩流井运行发现,立式水泵故障率高,备件费用昂贵,考虑到维修方便,降低成本,将立式水泵改造为卧式水泵,并将漩流井溜渣缝及切线的缺陷进行了改造。
2.
By means of uniting geometry with algebra, the arc length, tangent line, cotangent space and curvature of curve in four dimensional space are investigated, and the corresponding calculation formula in each cases are given.
用形数结合的观点研究了四维空间中曲线的弧长、切线、法空间和曲率问题，并给出了其计算公式。
3.
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。
4)  tangent displacement
切线位移
1.
The measurement of small angle offset based on tangent displacement;
切线位移法测量微小角度偏转
5)  shear line
剪切线
1.
In China,the steel production have been in the high speed development,For larger yield and higher plate rate,an effective shear line become very necessary.
在钢铁行业高速发展、宽厚板车间不断升级过程中,剪切线也逐渐为人们所重视。
6)  tangent surface
切线曲面
1.
The paper deals with curvature line and curvature characteristic of developable surface based on differential invariant of developable surface and it details curvature line and curvature characteristic of cone and tangent surface.
本文通过可展曲面的微分不变量,导出可展面的曲率线与曲率特征,并以锥面和切线曲面为例阐明这些特性的几何意义。
参考词条
补充资料：十报恩 赠段先生 折段字起
【诗文】：
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