Using recursive method is right for filled hexagons, was a very good graphics.
采用递归的方法对正六边形进行填充，得到了一个很好看的图形。
Tower of Hanoi is a typical problem that can only be solved using recursive method.
汉诺塔问题是典型的只有用递归方法才能解决的问题。
It proposes using parallel difference filters to suppress backgrounds, using logic and method to eliminate noise and using recursive method to cumulate the target tracks.
提出用并行差分滤波器去除背景，用逻辑与剔除噪声，用递归方法累积目标轨迹的算法。
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