We will strengthen and improve the system of public security.
加强和完善公共安全体系。
Emergency medical rescue system was the important part of public health system and city security system.
紧急医学救援体系是公共卫生体系与城市安全保障体系的重要组成部分。
We discuss the security of the PKI and propose an improved public key certificate system.
分析了现有PKI结构的缺陷，并设计了一个改进的公钥证书系统。
We discuss the security of the PKI and propose an improved public key certificate system.
分析了现有PKI结构的缺陷，并设计了一个改进的公钥证书系统。
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