We can speculate that the stone circles were used in some sort of pagan ceremony.
我们可以推测，这些石头排成的圆圈是用于某种异教崇拜仪式的。
According to experts speculate that general cement plastic rockery stone life in about 30 years, GRC plastic rockery stone life about 15 years, resin plastic rockery stone life in about 10 years.
根据专家推测，一般的水泥塑石假山的使用寿命在30年左右，GRC塑石假山的使用寿命约15年，树脂塑石假山的使用寿命在10年左右。
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