Static camera. The teacher moves the pointer along the drawn diagram, turns his head slightly to address the class, speaking continuously. Realistic hand movements, professional demeanor. On-screen dialogue (characters speak with lip-sync): Преподаватель: "Обратите внимание на эту схему. Отставание остряка от рамного рельса на 4 миллиметра и более категорически недопустимо." No background music.
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