How to make the bottom line of rivers, lakes and seas rich?

Copper, iron, silver, zinc, calcium, potassium and sodium.

There are many ways to link rivers, lakes, oceans, streams and bays, such as ghosts and gods, rugged mountains, earth walls, beaches, trees and forests.

Couplets, also known as antithesis, antithesis, spring stickers, Spring Festival couplets, couplets, peach symbols and couplets, are a kind of dual literature, which originated from peach symbols. It is a antithetical sentence written on paper, cloth or engraved on bamboo, wood and columns. It is a unique art form of Chinese, concise and profound, neat and even, with the same number of words and the same structure.