Bilateral symmetry The arrangement of parts in fan organism in such a way that the structure can only be divided into similar halves (mirror images) along one plane.

左右对称：通过中央轴，只有一个对称面将生物体分成左右相等的两部分（镜像）。

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One is the saddle-type structure where the projection point is located either in the up part or the down part of the phase plane, which is divided by both stable and unstable manifolds.

一类是投影点处的轨迹走向服从鞍点规律，且由于投影点位于稳定流形与不稳定流形分割的相平面的上部或下部，故轨迹将沿稳定流形方向到达动态鞍点再沿不稳定流形方向离开该点；

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The large scale parallel digital circuit with the one detector to one processor structure was used for the near distance image, the recognition of the part of plane could be realized.

对于近距离图像，采用探测元与处理电路一一对应的大规模并行数字电路，实现目标部位识别。

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