电力系统的水力模拟，则是在数学相似基础上的物理系统模拟。
Power system simulation using hydraulic system is a physical simulation based on mathematical similarity.
基于模型与系统物理相似或数学相似的模拟是进行电力系统研究的主要方法。
Simulation based on the physical or mathematical similarity between model and original system is the major research method in power system.
数学分析的结果表明，如果婚姻双方在情感上是相似的，则他们有一个‘最优努力策略’，其结果是幸福、长久的婚姻关系。
The results of the mathematical analysis showed when both members of union are similar emotionally they have an "optimal effort policy," which results in a happy, long-lasting relationship.
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