证书到期英语怎么说

证书到期英语翻译为"certificate expiration"。来源是证书在有效期内，一旦过期就不再有效。

例句1:
"Please renew your certificate before it reaches expiration date."（请在证书到期之前续期。）

例句2:
"The certificate has expired and can no longer be used for authentication."（证书已经过期，不能再用于身份验证。）

例句3:
"The certificate expiration date is on the bottom right corner of the certificate."（证书到期日在证书右下角。）