1. There are many people involved in the theme: you can describe the theme simply and clearly, and indicate the number and identity of the people involved in the description. For example, "the subject matter of the auxiliary shooting case is a red car with three passengers in it."
2. Theme of multi-person participation: You can describe the participants first, and explain their relationship with the theme in the description, and then describe the theme in detail. For example, "the auxiliary filming case involved three passengers who were in a red car."
3. The theme is related to many people: you can describe the theme in detail first, and then explain that the theme is related to many people in the description. For example, "the subject matter of the auxiliary case is a red car, which is related to three passengers."