Everybody help.

Method 1: Hang a monitoring camera on the edge of the lawn, which is just an empty shell, and then give a warm reminder: "This lawn is monitored 24 hours a day, please take care of the public green space and maintain the image. If necessary, we may file a claim based on the video content. "

Method 2: Automatic sprinkler, with inductive switch, will spray water around as long as someone approaches. Tap water is not used as water source. Wastewater and dirty water are better. Of course, there must be warm tips. This lawn is equipped with an automatic watering device. Please don't come near, or you will be at your own risk. Thank you.