I was disappointed to find that they had left already.
我發現他們已經離開了，覺得很失望。
He was disappointed to see she wasn't at the party.
看到她沒來參加晚會，他感到很失望。
I'm disappointed in you ─ I really thought I could trust you!
你真讓我失望——我原以為可以相信你的！
I was disappointed by the quality of the wine.
這酒的質量令我失望。
Don't raise your hopes too high, or you may be disappointed.
不要希望過高，否則你可能會失望的。