A small park, 400 meters long and 30 meters wide. Please help solve a health problem?

First of all, organize people around you (households can be used as a unit, participants can't ask him or her to pay a certain amount of money, and then the community will hire someone to take care of him or her and concentrate on a thorough cleaning activity.

Then:

1. Write this slogan on the outer wall of the trash can, "Every time you throw garbage consciously, you will get an extra blessing for yourself!" 》

2. Put up a placard at the school gate, which says, "Throw the garbage into the trash can, and those who do well are the smartest and most beautiful! 》

3. Put up billboards on both sides of the snack stand and write "Take a few more steps and throw the garbage into the bucket. Good luck will accompany your business!" 》

4. Put an advertisement in the middle of the residential building and near the end of the primary school, saying "Garbage is thrown into the bucket, beautiful environment, happiness comes into my home!" 》。