Much to our disappointment, the client decided to cancel the contract at the last minute.

令我們非常失望的是，客戶在最後一刻決定取消合約。

The delayed shipment caused great disappointment among customers who had preordered the new model.

延遲出貨讓預購新機型的顧客大失所望。

She expressed her disappointment with the hotel service in a polite email to the manager.

她在一封措辭客氣的電子郵件中，向經理表達對飯店服務的失望。