Divide the unit "1" into several parts on average, and the number representing such a part or parts is called a score, which is also a commonly used measurement method in daily life.

In fact, in our daily life, we have been applying the radioactive structure of mind mapping. For example, our car-centered transportation network; Self-centered personal, family, social, work and social relations.

They all drew the radioactive thinking structure diagram. It can be said that this kind of structure diagram is in our life.