Other approaches use a central certificate authority to issue certificates that guarantee secure communication from one point to another within a network.
其它方法使用中央认证中心来发放证书，这些证书保证了网络中从一点到另一点的安全通信。
When a user visits such sites, they are relying upon certificate Authorities (CAs), hundreds of companies that sign the certificates that supposedly guarantee secure browsing.
当用户访问这样的网址，他们依赖认证权威(CA)，这是数百个公司签署的证书来保证安全浏览。
All data for completion and acceptance of project shall be complete without loss, especially for pile-made data as quality guarantee of materials, acceptance certificate and test report.
对于竣工验收必备的所有资料必须准备齐全，不得遗漏，特别是制桩资料，如各类材料的质保书、出厂合格证与检测报告等。
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