Meaning:
1. Understand the age ratio of the existing population and make policies in time. For example, if we understand the population, we can formulate various policies.
2. Understand the future development of population and adjust various decisions. For example, if we know the future trend of population, we can modify the family planning policy appropriately.
3. Prevention and control of pests and diseases. For example, the population attracts females through chemical methods, resulting in males not mating.
4. Potential significance. For example, preserve historical materials so that scientists can conduct historical research and analysis in the future.