Prologue: Be quiet, students, and our class meeting will begin soon (if the class is not disciplined, put an interesting bmp on the first PPT blank page to let the students look forward, so the teacher won't have to)
"With the continuous development of society and the continuous improvement of our material living standards, people are paying more and more attention to their own health. So, what kind of hygiene habits can keep us away from germs and have a healthy body? I'll discuss it with you next class. I announce that the XX theme class meeting of XX class in XX middle school in XX city will begin now. "
Conclusion "Let's put it this way, these are all theoretical things, and it's useless to know without practice. I hope you can develop these good habits in your life. I declare that the class meeting of xxxxxxx is over, and please ask the class teacher to summarize. "
The content is the most important, just say the opening and closing remarks briefly, mainly because you must be confident when you announce the beginning and end.