Below ground level; underground. "Mencius Tengwen Gong under the": "Water from the ground and the Bank of China, Jiang, Huai River, the Han is also." Shen Song include "Meng Xi Bi Tan Magazine": "cover up the oil, was born to the infinite, not as pine Sometimes the exhaust. "Ming Xu Hongzu" Xu Yue Journey Travel Diary 3 ":" cover his office out of the water are transferred Gap, there must be a sluice gate, provided that such land Ming Jian little leakage of water from the earth in all go through. "
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Middle earth
Center of the earth. "Zhou Tai Situ local officials": "is on view in order to land in the ... ... to the King, ruler with Wucun, that land of." A Summary of justice: "to the person, for the Quartet of 9 also. "Xunzi Ontario chapter," saying: For nearly four adjacent slots in the Central. So the king choosing the home into the world. "
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Generally refers to geographical center
Refers to geographical center. Han Yu, "Quzhou Xu Yan Temple monument": "Qin at West side, special wusheng ... ... get along to Xu, the Bonaventure for the rule."