[U] being disappointed 失望; 沮丧: To our great disappointment, it rained on the day of the picnic. 使我们大失所望的是野餐那天下起雨来了. 
[C] ~ (to sb) person or thing that disappoints 令人失望的人或事物: Not getting the job was a terrible disappointment. 得不到那份工作, 叫人失望极了. * His children are a disappointment to him. 他的孩子让他感到失望.