C695 Sensing the Heaven and Earth

"How do you know?" Wan Shanhong asked.

"These three trees are in a triangle formation. If it wasn't for the pill furnace, they would have been born. " Wu Zhongyuan pointed at the rings on the tree trunks. "These rings are called rings. Every year the trees grow, there will be one more ring. The rings on these three trees are numerous and dense. It's hard to count them