One leading idea is that gravitational tidal forces reshaped the moon's crust and made it lopsided. But the new theory builds on the "giant impact" model that explains the moon's creation.
Mines are the important resource and environment for human being. Author discussed the prediction of mine disasters by macro precursors, image force theory and the effect of tidal force.
矿井是人类的重要资源和环境。从矿井内的宏观前兆、象力理论和引潮力的影响讨论了矿井灾害的预测问题。
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The shallow water wave theory is employed in the description of tidal flows.