a master model的用法和样例：
- After working for a year and a half learning new skills and more about building with LEGOs, he became a Master Model Builder.
- A great poet is a master melody.
- I wish I could be a master of this subject.
- He have a master's degree in business science.
- It is said that he is a master of intrigue.
- The first mate was studying to become a master.