The optimization has the following two meanings:the optimization of design ideas of environment of modern residential area and the optimization of elements of the elderly and children activity space.

According to the findings of developmental psychology,it is possible and necessary for the children and adolescents to participate in the social activities and undertake social responsibilities.

Friendship may influence many aspects of the social development of children and adolescents.

Study on tooth loss and prosthetic condition of middle-aged and elders in Liaoning province;

With the development of population aging,accessible transportation with the basement of taking care of the elderly and handicapped has drawn widespread attention.