a mistaken idea的用法和样例：
- He who feels above work has a mistaken idea of true nobility.
- Bob has a mistaken idea that tomorrow is a holiday.
- Most people have a mistaken idea that freedom means being able to say and do whatever they feel like.
- A false or mistaken idea; a delusion.
- The teacher has a mistaken opinion of this pupil.
- He is bedeviled by his mistaken ideas.