What was the meaning of "loose relationship" and "fixed relationship" in "Introduction to Society"?

In " Introduction to Society "," loose relationship " and " fixed relationship " were both commonly used concepts in sociology. Loose relationship refers to the way people interact with each other. It is not limited by time and place. It can be established and terminated through accidental events and contact. For example, friends, colleagues, neighbors, etc. This kind of relationship was usually built on the basis of common interests, interests, or emotions. "Fixed relationship" refers to the way people interact with each other. There are certain rules and patterns in the interpersonal relationships established by time and place. For example, families, lovers, couples, and so on. This kind of relationship was usually based on long-term life experience and emotional foundation. The difference between a "loose relationship" and a "fixed relationship" was that the former's way of communication was more casual, while the latter had certain rules and patterns. In social life, these two kinds of relationships play an important role. They can flexibly adjust people's communication methods according to needs, and at the same time, they can also help people better maintain and develop interpersonal relationships.