Unit 2: This unit includes chapter 3 and chapter 4. The security model has been designed by the studies on the security of the data and information system.
第二部分，通过对数据及信息系统安全的探讨得出列车运行图信息系统的安全模型，包括第三、四章。
Unit 2: This unit includes chapter 3 and chapter 4. The security model has been designed by the studies on the security of the data and information system.
第二部分，通过对数据及信息系统安全的探讨得出列车运行图信息系统的安全模型，包括第三、四章。
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