The heart is important in the body, the primary focus of a society so there is the main activity of every group of people of all ages is the center of the city.
The heart is important in the body as a primary focus of the society, so the key is to share a common area of activity of all people of all ages, the center of the city.
The heart is important in the main body is the main point of the society, so the heart is the space of all activities, people of all ages as the center of the city.