只有在平坦的宇宙中，空间才符合标准的几何规律——三角形的内角和精确地等于180度，平行线永远不相交。
Only in a flat universe does space obey all the standard geometry-class rules-the angles of a triangle add up to exactly 180 degrees and parallel lines never meet.
通过使用新的分析技术，埃雷兹·李伯曼和他的同事发现，基因组片段紧密地构成了一个“分形球”（译注：想象一下由面条揉成的球），尽管基因组片段相互扭曲纠缠，但它们之间却没有节点（译注：也就是面条球里的每根面条都不相交）。
Using new analytic techniques, Erez Lieberman and colleagues found that the genome is packed into what’s called a “fractal globule”—despite being intensely twisted, the string of genes never knots.
PLS算子通过聚类分析将种群分割为互不相交的邻域子种群，对每一个子种群应用单纯形法进行并行局部搜索。
PLS partitions the population into a group of disjoint subpopulations by cluster analysis, then USES simplex method to search local optima in each subpopulation in parallel.
加泰隆数又是用不相交的对角线划分几边形成三角形的方式数。
The Catalan numbers also count the number of ways in which ann-gon can be dissected into triangles by nonintersecting diagonals.
设P和Q为平面内两个互不相交的简单多边形 ，若 P在平面内绕某点旋转 ，文中讨论了其旋转可移动性问题 。
Let P and Q be two nonintersecting simple polygons in the plane, this paper discusses the rotational movability of them if P rotates around a point and collides with Q .
设P和Q为平面内两个互不相交的简单多边形 ，若 P在平面内绕某点旋转 ，文中讨论了其旋转可移动性问题 。
Let P and Q be two nonintersecting simple polygons in the plane, this paper discusses the rotational movability of them if P rotates around a point and collides with Q .
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