A blue-blooded person is from a royal or noble family.
例句
...blue-blooded aristocrats.名门贵族
英英词典释义
Adjective
1. belonging to or characteristic of the nobility or aristocracy;
"an aristocratic family""aristocratic Bostonians""aristocratic government""a blue family""blue blood""the blue-blooded aristocracy""of gentle blood""patrician landholders of the American South""aristocratic bearing""aristocratic features""patrician tastes"