This is the center circle of the pattern.
这是图案的中心圈。
The center says the pattern should begin to weaken in a week or two.
该中心说这一走势应该会在一两周后开始减弱。
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.
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。
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