The billing error went unnoticed for three months until the auditor reviewed our accounts.

這筆帳單錯誤三個月都沒被發現，直到稽核人員審查我們的帳目。

Several customer complaints remained unnoticed because the support inbox was not checked regularly.

由於客服信箱沒有定期查看，好幾則客戶抱怨一直無人注意。

A small crack in the shipping container went unnoticed during the final inspection at the port.

貨櫃上的一道小裂縫在港口最終檢查時沒有被注意到。