提出利用 余 弦变换，研究 规则体重力异常谱特征及反演方法。
The paper proposed the characteristics and inversion method of gravity anomalies spectrum using cosine transform.
利用变换思想，对圆锥曲线教学中的一道例题进行分析，得出了各种圆锥曲线的焦点弦，并引伸其结论，将圆锥曲线的焦点弦变换为中心弦。
By using transformation thought, this paper obtains the focus chord of all kinds of conic section through analyzing a sample in conic section teaching.
最后，关于弦场和辅助场，我们获得了可以给出任意高级次场方程和规范变换的递推公式。
Finally the equation for any higher level and the descent formula of gauge transformations for the string field and the supplementary field are given.
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