For every large time intervals and for stars near to the pole, it is necessary, however, to use the exact formulae of spherical trignometry . 对于很长的时间间隔和靠近极星的恒星，必须使用精确的球面三角公式。
Indeed, the reader who is slightly familiar with tessellations of the sphere, the eaclidean plane and the hyperbolic plane, can easily prove the following result . 事实上，稍微熟悉球面、欧几里得平面和双曲平面的分格的读者，都能容易地证明出下面的结果。
Optimization analysis of single - layer reticulated dome 单层球面网壳的优化分析
Two new families in the stable homotopy of spheres 球面稳定同伦中的两个新元素族
On isometries between unit spheres of abstract m spaces 空间的单位球面之间的等距
Square set screws with long dog point and rounded end 方头长圆柱球面端紧定螺钉
Application of pin with spherical head in tribology 球面销试样的摩擦学应用研究
Sphere and torus lathe machining facility mould 球面及圆环面零件车加工的简易模具
Rolling bearings ; spherical roller bearings , double row 滚动轴承.双列球面滚柱轴承
It is used for measuring parameters of sphere 其目的是对内外球面的参数进行测量。
