According to one study,those who only stairs of residential apartment building people,the average life expectancy than those living in both the stairs and elevator building where residents above 3 years.A second study shows,elderly residents of buildings with elevators,annual visits to doctors is two times higher than the residents of buildings without elevators.These findings suggest that,even climb the stairs that daily exercise,can improve people's health and longevity.
Last October,Belleville city in the central business district of installation of the lighting system,high density,therefore,vandalism started to decline.The police have stepped up to the area of the patrol,and the crime rate process was obviously decreased.Therefore,the installation of lighting system is the most effective method of fighting crime and.We can reduce crime in this way,so as to inject new vitality into the existing unsafe factors of community.