primary circle

In other cases, a spherical model is used, and the primary distance calculation used is the great-circle distance ( see Resources).

在其他情况下使用球面模型，所使用的主要距离计算为大圆弧长（参见参考资料）。

Optimum Analysis of Seidel Aberrations Calculated with Zernike Circle Polynomials for the Obscured Aspherical Primary Mirror

中心遮拦非球面主镜Seidel像差拟合分析的优化

The author considers that traditional art education in primary school as well as middle school committed an error circle since we have ever been emphasized the possession of artistic knowledge and skills.

研究者认为，长期以来我国中小学美术教育进入了一个误区，究其根源就是过于强调美术专业知识与技能本位。

The concept of polarization area, a globally meaningful metropolis circle development mode and construction form, is a primary trend of metropolitan development in the world.

极化区是具有全球意义的都市圈发展模式及空间组合形式，是当今世界范围内都市圈发展的主体趋势。