What does three lines and one row mean?

Three lines and one row means safety slogans. The "three lines and one row" refers to the insurmountable red line that development must not be at the expense of human lives. The third row includes the investigation, sorting and elimination of potential accident hazards. Investigation is the process of organizing safety management personnel, engineering technicians and other relevant personnel to investigate hidden dangers in the unit, register them according to the level of hidden dangers, and establish hidden danger information files. Sorting is the process of prioritizing and classifying hidden dangers according to their difficulty in rectification and treatment and their scope of impact. Elimination is the process of eliminating or controlling hidden hazards.