The numerical simulation and theoretical analysis for sea water intrusion in coastal region are very important in the theory and practice of the environmental science.

滨海含水层中的海水入侵数值模拟和理论分析，是环境科学中十分重要的理论和实际问题。

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To realize the Visual simulation based on PC need studying thorough the theory of Visual simulation and the structure of simulation system, and put them into practice.

在PC机上实现视景仿真，需要对视景仿真实现原理和仿真系统体系结构进行深入思考与积极实践。

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In sand table simulation, participants experienced a process from theory to practice and theory, and his personal experience of valuable practical experience into a comprehensive theoretical model.

在沙盘模拟中，学员经历了一个从理论到实践再到理论的上升过程，把自己亲身经历的宝贵实践经验转化为全面的理论模型。

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