Reef sand, reef, reef beach, reef, reef beach, reef, floating reef, atoll, reef, shallow reef, sand reef, stone reef, rock reef, Great Barrier Reef, coral reef.

"Jiao" is a standard word (commonly used word) in modern Chinese. It is pronounced as jiāo in Mandarin, which was first found in bronze inscriptions and belongs to pictophonetic characters in Liu Shu. The basic meaning of "reef" is the looming rocks above and below the water surface in rivers and seas, such as reefs; The extended meaning is a rock formed by the accumulation of coral remains, such as coral reefs.

In daily use, "reef" is also often used as a noun, indicating the name of the ore. It can be seen from the surface that the silver content is high, such as reef sand.