To build a 3d simulation team or migrate an existing 2d simulation team to 3d simulation environment, maintenance of agent world model is the first core problem to consider.
要建立新的3d仿真球队或者把2d仿真球队移植到3d仿真环境中，需要考虑的第一个核心问题就是世界模型的维护。
For the complexity and variability of customer retention and loyalty management, how to build a well-structured service assurance model is a practical problem.
鉴于客户保持及忠诚度管理的复杂性和多变性，如何建立一种优良结构的业务保障模型成为一个现实问题。
The primary problem of the load forecasting is the selecting of the forecasting technique, namely, how to build a forecasting model which is applicable to the studied district.
负荷预测的核心问题是如何选取合适的预测方法，即如何建立适用于所研究地区的负荷预测的数学模型。
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