... i understand a few part, not good » 我明白几个部分，而不是良好 level geometry » 级几何 inconvenient truth » 麻烦的真相 ...
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应用光程函数法计算出旋转对称电子光学系统的7级几何像差，给出旋转对称电磁场同时存在情况下的系统7级几何像差表示式。
The 7th order geometrical aberration of rotationally symmetrical electron optic system and their expressions are given by using the eikonal method when the electric and magnetic fields exit.
这种方法是我大儿子读三年级学习几何的时候，我在无意中发现的，也许对你会很有启发。
I stumbled upon this approach when my oldest son was taking Geometry in third grade, and it's perhaps my best advice.
本文通过选择合适的“参考点”和提出“空间级”概念，给出了多维空间的几何意义。
By choosing the suitable "referenced point" and defining "space Grade", this article gives geometry meaning to multi - dimension space.
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