如果，椎体的曲线可以通过数学方法流畅地表达出来，我们分析矢状方向上的平衡的能力将会得到极大的强化。
If the spinal curve could be expressed as a smooth mathematical function, the ability to analyze sagittal balance would be greatly enhanced.
本文运用简单的数学方法推导出惯性系矢径方程的另一种坐标和时间变换式。
With the help of the simple mathematical method, another transformation formula of coordinates and time between the radius vector equations in inertial frames is derived in the paper.
根据光束传输的能量分配守恒法则和折射定律建立方程组，通过数学软件数值求解方程组，解得非球面矢高表达式。
The expression of aspheric surface is obtained by solving numerically equations based on law of conservation of energy and refraction law by mathematical software.
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