What are the bones, tendons, veins, flesh and skin of calligraphy?

Bone: refers to a hard stroke, such as a silver hook. Through the back of the paper. Meat means that the strokes should not be too thin. Tendons are neither fat nor thin, just right. It seems natural. Blood means that the whole word can present a whole sense. Qi is the feeling of intentional disconnection between pens. In some places, there are thin spring connections.