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。
That can be addressed with multifocal lenses, which have concentric rings of material that offer alternate bands of near and distant vision.
这个问题可以使用多焦点人工晶体来解决，它拥有一些同心圆环，该圆环上的物质能提供交替调节近距离和远距离视力的区带。
Fresnel lenses with concentric rings are widely used in optical applications, however a similar principle can be used to focus acoustic waves.
菲涅耳透镜在光学中很常用，而利用相同的原理可以汇聚声波。
Fresnel lenses with concentric rings are widely used in optical applications, however a similar principle can be used to focus acoustic waves.
菲涅耳透镜在光学中很常用，而利用相同的原理可以汇聚声波。
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