Even in ancient times, there were many more "professional" diplomatic words. For example, those expressing foreign policy include: intervention, reconciliation, marriage, peace talks, fraternity, enmity, canonization, reward, tribute, tribute, etc. .

For example, those expressing diplomatic missions include: envoys, missions, envoys, deputy envoys, etc.;

For example, those expressing the status of diplomats include: envoys to the Sui Dynasty, envoys to the Tang Dynasty, envoys to trade, etc.;

For example, diplomatic documents include: official documents, letters of appointment, edicts, etc.

Of course, more “popular” terms include: century-old friendship, mutual non-aggression, good-neighborly friendship, connected by mountains and rivers, friendly neighbors, etc.~~