A MODEL FOR UNIMODAL MAPS的用法和样例：
- Held the essay up as a model for the students.
- He looked like a model for an outdoor catalogue.
看 上 去 是 那 种 户 外 运 动 健 将 。
- Teachers provide a model for children to imitate.
- She has served as a model for several painters.
- She served as a model for several painters.