在签发证书前，认证中心对请求方进行适当的背景检查，以验证该请求方就是它自己所声称的请求方。
Before issuing a certificate, Certification Authorities run appropriate background checks on the requestor to verify that the requestor is who they say they are.
背景：椎弓根螺钉贯穿脊柱前中后三柱，具有三维矫正作用，已成为标准的脊椎后路内固定方法。
BACKGROUND: Pedicle screw which passes through the three columns and has three-dimensional correction function, which has quickly become the standard posterior spinal internal fixation.
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