It consists of concentric semicircles of a polymer laid down on a gold film.
由一个同中心的半圆聚合物放置在金制膜层上构成的。
2
It is only recently that researchers have started looking at the strange squiggles, semicircles, lines and zigzags that surround them.
只有到了现在，研究人员才刚刚开始观察石壁上那些奇怪的胡乱书写的文字、半圆图形、线条和锯齿形。
3
When faced with such spectacular beauty, who could blame the visiting anthropologists for largely ignoring the modest semicircles, lines and zigzags also marked on the walls?