valid certificate

基本解释

So you can leave this text field empty (none) and later check that a valid certificate is selected at run time.
因此，您可以将此文本字段留空 (none) 并在以后运行时检查是否选择了有效的证书。
But if a valid certificate can be obtained, neither the user nor the browser have any idea that they have been hijacked.
但是，如果可以获得一份有效的证书，无论是用户还是浏览器都不会有被劫持的想法。
In the first case, that string is an explicit service level, for example GoldService, and in this case it is the CN of a verified, valid certificate.
在第一个实例中，字符串是一个直接的服务级别（例如 GoldService），在这种情况下它是已通过检验的、有效证书的 CN。

With these forms of ownership, your beneficiaries would simply need to provide a death certificate and a valid form of ID to take ownership of the property.
FORBES: Is Lack of Planning Putting Your Family in Danger?
In an email sent to customers and a pair of Facebook posts, the firm announced that it will halt updates as of next month and that its security program's VeriSign certificate is only valid until September 15th.
ENGADGET: Victorinox nixes software updates for USB drives, security certificate to expire in September