When the web worked normally, it passed through the central axle of the light pole so that the optical power received by photosensitive diode was normal constant.
带材正常运动时处于光柱的中心位置，光电二极管接收到的光功率为一定值；
The population spatial distribution took on the form of"pole-axle-circle"pattern.
黄河流域人口空间分异呈现出“点轴圈”的空间结构模式。
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