Find the most popular classmate in the research group (I don't know if there is a doctor), if it is a sister, it is best. Communicate with her about you in advance, and ask her to help you find a time to invite the teacher to have a meal (a simple and quiet place around the school is enough). Communicate the misunderstanding of the experiment with the teacher while eating, and your sister or brother will help you walk around. Try to explain the misunderstanding clearly within a meal.