We were deeply disappointed at/about the result.

我们对结果深感失望。

I am already disappointed at him.

我对他已经失望了。

The boy felt disappointed at the match.

那男孩对那场比赛感到失望。

We were disappointed at his listless attitude.

我们对他没精打彩的态度感到失望.

You must be disappointed at losing the chance.

失去这次机会，你肯定很失望吧。

I am disappointed at the disappointing report card.

我对令人失望的成绩单感到失望。

Many Indians were disappointed at the lenient terms;

很多印度人对于夸大的判罚感到失望；

I was rather disappointed at not getting the tickets.

没有搞到票子我很失望。

People feel disappointed at the realities of morality.

人们对于现代社会的现实感到失望。

He was disappointed at there not having been meat there.

他对那里没有肉吃感到失望。