客户可以使用凭证授权单位 （CA）核发的有效凭证。

The customer can use a valid certificate issued by a certification authority (CA).

youdao

不过，优点是规模较小的客户不需要花费大量时间和金钱取得凭证授权单位所核发的凭证。

However, the benefit is that it prevents smaller customers from having to spend the time and money required for a certificate issued by a certification authority.

youdao

不过，优点是规模较小的客户不需要花费大量时间和金钱取得凭证授权单位所核发的凭证。

However, the benefit is that it prevents smaller customers from having to spend the time and money required for a certificate issued by a certification authority.

youdao