表达性需求(expressive need)： 当个人把自身的感觉性需求以行动来展示，即成为一种表达性需求；如案主已申请服 务、登记、排队等行动，表达出对某一项服务之...
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这使表达真实功能性需求的事件流程易于阅读和理解。
This makes the flow of events, which represents the true functional requirements, much easier to read and understand.
答：版本5技术预览并不用Web服务描述语言(Web Services Description Language, WSDL)文件表达安全性需求。
Answer: the Version 5 Tech Preview does not express security requirements in the Web Services Description Language (WSDL) files.
为满足联锁软件黑箱测试的要求，对联锁软件安全性需求进行了分级形式化表达。
To meet the requirements for black box testing of CISS (Computer Interlocking safety critical Software), the safety requirements of CISS are denoted hierarchically and formally.
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