From King Zhuangzi Qin: "Living in Wei, I don't make clothes for ten years. He was crowned and destroyed. He stretched out and didn't stretch out. He was determined to win. "

Idiom explanation: pull the skirt to expose the elbow, describing the clothes are tattered. Metaphor attend to one thing and lose another, poor to cope with.

Knees, skirts; Elbow, elbow; Look, this is now, this interchangeable word, showing and revealing.