More over, the center of the octothorpe is also the center of Chinese coal resources centralized and focused exploiting region.
且“井”字之中心，又恰是中国煤炭资源分布和开发建设之重心。
2
The new cognition of the octothorpe shaped distributing pattern is gotten after synthesized deliberation of coal resource geologic, geographic and socioeconomic regional differentiating phenomena.