a royal princess的用法和样例：
- It's disgusting the ridiculous airs she gives herself!You'd think she was a royal princess or something!
- The French Foreign Legion was founded by a Royal Ordinance.
- The keeper of a royal forest or park.
- We were treated to a royal feast.
- There is a royal proclamation of the birth of the prince.
- They named her after the Sweden's two-year-old royal princess Engrid.