不适合放在用例中的需求（功能性和非功能性）应当在补充规约中进行详细描述。
The requirements (functional and non-functional) that do not fit appropriately within the use cases should be detailed in the Supplementary Specifications.
从功能上来说这没有什么明显的问题，只要你想，你总可以根据规约实现基于类的OO。
And there is no obvious problem in power, since you can always do class-based OO by convention, if you want.
通信前置系统具备通道管理、差错控制、传输控制、规约解释、报文处理和数据备份等重要功能。
FEPC has many important functions, such as communication management, error control, protocol conversion, data backup, and so on.
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