be disappointed in

• vt. 对 ... 失望(对 ... 感到不愉快)

be disappointed in的用法和样例：

例句

1. Our Heavenly Father invented man because he was disappointed in the monkey.
   我们的天公老爷，因对猴子失望而创造了人。
2. I'll try to do better so that he won't be disappointed in me.
   我要努力做得更好，免得他对我失。