within the borders of the country; throughout the land; the whole world. Based on the ancient belief that China was surrounded by four seas.

to exist; to live; to survive; to remain on balance or be in stock

A very close or bosom friend who understands one's heart; someone with whom one shares a deep and mutual understanding

(idiom) even though the ends of the earth separate us, we are as close as next-door neighbors; used to describe deep friendship that overcomes physical distance