The catalan numbers also count the number of ways in which an n-gon can be dissected into triangles by nonintersecting diagonals . 加泰隆数还数计有多少方式来将多边形用不相交的对角线划分成三角形。
The smallest inscribled regular triangle of a triangle 三角形的最小内接正三角形
Some look like cigarettes , and some look like triangles 有些像香烟,有些像三角形
It ' s not an obstacle , it ' s the second triangle 这不是障碍,这是第二个三角关系
The bald eagle . - i got the bermuda triangle 白头雕牌-我用的是百慕大神秘三角牌