How to ask for leave if you don't want to study abroad?

Examples of not wanting to take time off during a study trip are as follows:

Dear teacher: Hello, I am a student of XXX, and I hereby request that I can't take part in the study tour arranged by the school, because I have some important family reasons, so I can't take part in this trip. The travel plan is arranged between XX and XX, starting point XXX and ending point XXX. The purpose of this study tour is to deeply understand the natural environment and customs. After discussing with my family, we decided not to take part in this research trip.

We decided to let me stay at home because of some unexpected circumstances at home. I am well aware of the value of this study tour to our classmates, but I also need to stay at home and deal with many family affairs.

Finally, thank you again for your guidance. Hereby, pay tribute!

Study tour:

Research travel is a kind of travel activity for the purpose of learning. It is emphasized that through personal practice, perceptual experience and the guidance of professional tutors, the knowledge and information of local culture, history, social customs and ecological environment can be deeply understood, and the comprehensive quality and cognitive level of participants can be improved. Study tours are often organized by schools, scientific research institutions or professional institutions to broaden their horizons, improve their knowledge and skills, and enhance their understanding and appreciation of society, nature and humanities.

The main feature of research travel is to integrate the dual elements of education and tourism, highlight practicality and experience, and let participants learn, feel and grow during the travel through various forms of learning activities.