2. sea: a common word (a kind of word) in modern Chinese, pronounced H m 4 I, is a pictophonetic character. The inscription, which first appeared in the Western Zhou Dynasty, originally means the sea (the largest water area on the earth), that is, the water area near the connection between the mainland and the ocean. Er Ya Shi Di: "Nine-one, Buddy, Seven-glory and Six-fullness are the four seas." Can be extended to the west, foreign countries, can also be extended to too many, unrestrained and so on.