Explanation: 1. Brittle bones. Often used as a metaphor for the weakened body of an old man or the thin content of a poem; 2, the cartilage of an animal used as food; 3, specifically referring to the edible cartilage part of an animal in food, such as the front of a chicken keel bone, the bonding surface of a pig's bone; 4, the phonetic translation of the Korean word for "supreme".

Quoted Poem: Yu Xin, Northern Zhou Dynasty, "Bamboo Staff Fugue": "The cold passes with pathos, the traveler is sad, the sparse hairs against the arrow, the brittle bones being in the wind and frost." .