a look of disbelief的用法和样例：
- Breetai stared at the screen with a look of disbelief that quickly refocused as anger.
- Our friends have a look of cheerfulness.
- Her eyes held a look of silent appeal.
- She threw me a look of encouragement.
- There was a look of wonder in his eyes.
- He knelt in front of the emperor with a look of entreaty.