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There is a calligraphy and painting hanging in the school library. What does it say? (including fine print)
The content is as follows:

Heroes in the world have no owners, and teenagers are worried about this.

In the last year, the students of Meng Dong 1989 got together and sent an X book once a month to his alma mater Boluo Middle School.

(I can't see the author's name clearly. If possible, the subject may wish to make a close-up of the author's seal to help identify it. )