为什么插的越快叫得越凶

What was surprising was that he had advanced to the eighth level of Ningzhen and was so powerful. What's sad is that he dug so many spiritual stones and they were all used up by him. As for this Duolingshi, he had only advanced to the eighth level of Ningzhen. With his cultivation speed, how many spiritual stones does he need to advance to the Xuandan realm?...