Principle and design of a ring sight consisting of calcite crystal plate and polarized elements are proposed.
本文介绍一种光环瞄准镜的原理和设计，它是用方解石晶体薄片和偏振器件组成。
The ring sight presents a set of concentric rings when it is illuminated by the target and the background. Brightness of the rings is in proportion to that of the target and the background.
在目标光和背景光的照射下，呈现出一组同心圆环，其亮度与目标和背景的亮度成正比。
But, for answer, the old man only held his lanthorn up, so that in the ring of its pale light they saw some sight or other in the street.
不过，作为答复，老人只是把灯笼高高提了起来，好让他们在那黯淡的光圈中能见到些街上的景象。
Changchun Bridge Road & Yuanda Road, connected with West Ring 3 and West Ring 4, is an important traffic artery and sight-seeing avenue of Beijing Haidian District.
长春桥路—远大路连接着西三环路和西四环路，是北京海淀区一条重要的交通干道和景观大道。
Changchun Bridge Road & Yuanda Road, connected with West Ring 3 and West Ring 4, is an important traffic artery and sight-seeing avenue of Beijing Haidian District.
长春桥路—远大路连接着西三环路和西四环路，是北京海淀区一条重要的交通干道和景观大道。
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