Please ask someone to help you see how to do this problem. This requires a process. Thank you.

One day, two children passed by the cabbage. I found that the cabbage in the cabbage field was littered, and some of them were not like it. After careful observation, they found the footprints of someone walking beside the cabbage. So they decided to find a way to stop people from doing this. At this time, one of the little boys took a sign and wrote (the words on the picture). Done, the two went home happily?