其他的看起来像是一组同心圆由中心向四周辐射，圆心有几架飞机。
The other pattern that looks like some sort of targeting grid is set up with concentric rings of what appear to be structures with straight spokes radiating out from the center.
该圆周的圆心即定位的中心孔位置。
The center of circle is the position of the centre hole for positioning.
绿洲中环中心工程占地面积大、幢数多、主楼高度高，平面由多个不同圆心、不同半径圆弧组成，测量放线难度高。
The Lüzhou Zhonghuan Center project has characteristics such as large area, multiple buildings, high main building, many circle center and arc with different radius, difficulty setting-out.
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