一条直线与一条弧线有两个公共点，我们就说这条直线是这条曲线的割线。与割线有关的定理有：割线定理、切割线定理。常运用于有关于圆的题中。
n. secant
adj. transversal
misc. secant line
分割线 Cutting line ; parting line ; split line ; tieku
割线刚度矩阵 [数] [力] secant stiffness matrix
切割线 cutting line ; lone of cut ; line of cut ; lone of cut/ cut line
切割线引导位置 Wire Guides
割线模量 secant modulus
割线钳 cutting pliers ; cutting g pliers
黄金分割线 fibonacci lines ; Fibonacci retracement ; Fib Expansion Level ; Fibonacci Expansion Level
割线方法 secant method
绝缘割线器 wire cutter
选择椭圆选框工具(M)然后在分割线上面画出一个椭圆。
Select the Elliptical Marquee Tool (m) and make a selection over the divider line.
然后使用矩形选框工具删掉分割线上半部分，这样就剩下了半个椭圆。
Once you’ve blurred the ellipse, cut the top half away from the divider by using the Rectangular Marquee Tool and deleting the area beneath it so that you are left with half an ellipse.
年轻一代的塞浦路斯人没有统一岛屿的记忆，“绿线”看起来更像是永久的分割线。
Younger Cypriots have no memory of a united island and the "green line" is coming to look like permanent partition.
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