Please explain China and barbarians.

In the early days of China, a country was actually a city, so the people of China were urban residents. At that time, China people took the family as the unit, so one country was often another family, so China people were actually a big family, and the head of the family was the monarch. Savages are not their own country/city/family, nor are they nobles. He often lives outside the city, hence the name Savage.