The research results showed that the main ore structure is oolitic with a typical band structure of concentric rings.
结果表明：矿石以鲕状构造为主，具有典型的同心环带结构。
The additional light-emitting diodes are fixed to the light body in such a way that the optical axes thereof form a concentric light spot in the form of a ring around the main light spot.
多个附加发光二极管固定在照明本体上，以这样的方式它们的光轴形成一个环绕主照明区的同心环形照明区。
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