valid certificate的用法和樣例：
例句
- The Unified Messaging server will look for a valid certificate in this order.
統一消息服務(wù)器將按下面的順序查找有效證書(shū)。 - To change the fan-speeds, users need to authenticate with valid credentials of an user-account with admin privileges.
改變風(fēng)扇的速度，用戶(hù)需要驗證的有效證書(shū)的用戶(hù)帳戶(hù)管理員特權。
