a bright idea的用法和样例：
- Just then a bright idea occurred to me.
- You had a bright idea, thank you so much.
- CFO: Why do these engineers always have a bright idea at the last minute?
- These mostly are sporadic events, in which people just happen to awaken with a bright idea.
- A teacher who never had a bright idea in his life will probably reprimand a student who has one instead of encouraging him.