Websites prove their identity via certificates, which are issued by certificate authorities. Most browsers will no longer trust Symantec, the certificate authority for %S.
网站凭借证书颁发机构所签发的证书证明自己的身份。大多数浏览器都将不再信任 %S 所用证书的颁发机构赛门铁克（Symantec）。