Because if you don't charge postage, people who don't need books will collect them, and those who don't need books will take them back to sell waste paper, so there will be cases where children who really need books can't get them, and those who don't need books will take them back to sell waste paper! Then the free book resources will be wasted, and the public welfare books will become meaningless!

At the same time, publishing houses send books to recipients, which requires additional expenses such as freight, workers' packaging wages, packaging materials, warehouse storage costs, and transportation from publishing houses to warehouses!

introduce

Books are the main tools used by human beings to record all their achievements, and also the important media for human beings to blend their feelings, acquire knowledge and inherit their experiences, which has made great contributions to the development of human civilization. At all times, people always give the highest affirmation and special care to books.

Books are works recorded on certain forms of materials with words or other information symbols for the purpose of spreading culture. Books are the product of human thoughts, and they are a specific and developing tool for knowledge dissemination.