A: According to my knowledge, there are many non-governmental security service companies in Beijing.
答：据我所知，在北京目前有很多民间保安公司。
Expert-level knowledge and experience in application security, scalability and performance.
专家级知识与应用的安全性，可扩展性和性能体验。
Public key Infrastructure (PKI) has become the key knowledge to provide security service in Internet.
公钥基础设计PKI已经成为网络安全关键技术。
Public key Infrastructure (PKI) has become the key knowledge to provide security service in Internet.
公钥基础设计PKI已经成为网络安全关键技术。
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