law of geometrical crystallography

例句：

1. 1. Thegeometry of the triangle is afundamental concept in calculus.
   三角形的几何学是微积分的一个基本概念。
2. 2.The geometrical shape of the planet isdetermined by its rotation around its axis.
   行星的几何形状是由其绕轴旋转决定的。
3. 3. The geometrical construction of the bridgewas meticulously planned.
   这座桥的几何构造被仔细规划过。