这种适应性是我们的编程模型最重要的部分，此外，编程模型还包括规则语言和相关工具，用于给新的用户提供自定义功能。

This kind of adaptation becomes a first-class part of our programming model with the addition of a rules language and associated tools, offering customization capabilities to new kinds of users.

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分析了PSCAD/EMTDC的软件结构，提出了基于PSCAD/EMTDC和C语言接口技术的自定义模型的实现方法，用C语言构建了以实际保护装置为原型的数字式距离保护模型。

The program structure of PSCAD/EMTDC is analyzed, and the method of realizing the user-defined model which is based on the interface technique between PSCAD/EMTDC program and C language is presented.

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