symmetrical lens是什么意思

用法例句

The five points difference method is used to calculate the voltage distribution on the meridian surface of axial-symmetrical electrostatic lens.

采用五点差分法计算轴对称静电透镜子午面上电位分布 ,再从普遍轨迹方程求得的电子轨迹出发得到透镜焦点和球差。

Design and fabrication of asymmetrical GRIN lens arrays;

非对称GRIN微透镜阵列的设计与制作