C175 Quality Product

In the common impression, coal was black, so the black stone dug up in the coal mine was probably coal.

However, in the eyes of professionals, they scoffed at such thoughts.

"Don't be so excited, it's just some rock wrapped in pulverized coal. It can't be used at all!" Professor Hee patiently explained.

He had never been as happy as he was today. Not only had he earned ten million